| Commit message (Collapse) | Author | Age | Files | Lines |
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This provides a simple interface to trigger the firmware_class loader
to test built-in, filesystem, and user helper modes. Additionally adds
tests via the new interface to the selftests tree.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This is a tiny clean up for typos in the firmware_class README.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This patch fixes the following checkpatch warnings:
- Remove else after return
- Add space after declaration
Tested by compilation only.
Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Sort the list of managed interfaces and their lists of methods
alphabetically, to reduce the risk of merge conflicts and duplicates.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Commit 64c862a83... added new alloc variants to the devres managed
API. These should be included in the list of managed API found in
devres.txt.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Joe Perches <joe@perches.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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fixes checkpatch.pl trailing whitespace errors
Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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s/static_name/name_is_static
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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[ I'm currently running my tests on it now, and so far, after a few
hours it has yet to blow up. I'll run it for 24 hours which it never
succeeded in the past. ]
The tracing code has a way to make directories within the debugfs file
system as well as deleting them using mkdir/rmdir in the instance
directory. This is very limited in functionality, such as there is
no renames, and the parent directory "instance" can not be modified.
The tracing code creates the instance directory from the debugfs code
and then replaces the dentry->d_inode->i_op with its own to allow
for mkdir/rmdir to work.
When these are called, the d_entry and inode locks need to be released
to call the instance creation and deletion code. That code has its own
accounting and locking to serialize everything to prevent multiple
users from causing harm. As the parent "instance" directory can not
be modified this simplifies things.
I created a stress test that creates several threads that randomly
creates and deletes directories thousands of times a second. The code
stood up to this test and I submitted it a while ago.
Recently I added a new test that adds readers to the mix. While the
instance directories were being added and deleted, readers would read
from these directories and even enable tracing within them. This test
was able to trigger a bug:
general protection fault: 0000 [#1] PREEMPT SMP
Modules linked in: ...
CPU: 3 PID: 17789 Comm: rmdir Tainted: G W 3.15.0-rc2-test+ #41
Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS SDBLI944.86P 05/08/2007
task: ffff88003786ca60 ti: ffff880077018000 task.ti: ffff880077018000
RIP: 0010:[<ffffffff811ed5eb>] [<ffffffff811ed5eb>] debugfs_remove_recursive+0x1bd/0x367
RSP: 0018:ffff880077019df8 EFLAGS: 00010246
RAX: 0000000000000002 RBX: ffff88006f0fe490 RCX: 0000000000000000
RDX: dead000000100058 RSI: 0000000000000246 RDI: ffff88003786d454
RBP: ffff88006f0fe640 R08: 0000000000000628 R09: 0000000000000000
R10: 0000000000000628 R11: ffff8800795110a0 R12: ffff88006f0fe640
R13: ffff88006f0fe640 R14: ffffffff81817d0b R15: ffffffff818188b7
FS: 00007ff13ae24700(0000) GS:ffff88007d580000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000003054ec7be0 CR3: 0000000076d51000 CR4: 00000000000007e0
Stack:
ffff88007a41ebe0 dead000000100058 00000000fffffffe ffff88006f0fe640
0000000000000000 ffff88006f0fe678 ffff88007a41ebe0 ffff88003793a000
00000000fffffffe ffffffff810bde82 ffff88006f0fe640 ffff88007a41eb28
Call Trace:
[<ffffffff810bde82>] ? instance_rmdir+0x15b/0x1de
[<ffffffff81132e2d>] ? vfs_rmdir+0x80/0xd3
[<ffffffff81132f51>] ? do_rmdir+0xd1/0x139
[<ffffffff8124ad9e>] ? trace_hardirqs_on_thunk+0x3a/0x3c
[<ffffffff814fea62>] ? system_call_fastpath+0x16/0x1b
Code: fe ff ff 48 8d 75 30 48 89 df e8 c9 fd ff ff 85 c0 75 13 48 c7 c6 b8 cc d2 81 48 c7 c7 b0 cc d2 81 e8 8c 7a f5 ff 48 8b 54 24 08 <48> 8b 82 a8 00 00 00 48 89 d3 48 2d a8 00 00 00 48 89 44 24 08
RIP [<ffffffff811ed5eb>] debugfs_remove_recursive+0x1bd/0x367
RSP <ffff880077019df8>
It took a while, but every time it triggered, it was always in the
same place:
list_for_each_entry_safe(child, next, &parent->d_subdirs, d_u.d_child) {
Where the child->d_u.d_child seemed to be corrupted. I added lots of
trace_printk()s to see what was wrong, and sure enough, it was always
the child's d_u.d_child field. I looked around to see what touches
it and noticed that in __dentry_kill() which calls dentry_free():
static void dentry_free(struct dentry *dentry)
{
/* if dentry was never visible to RCU, immediate free is OK */
if (!(dentry->d_flags & DCACHE_RCUACCESS))
__d_free(&dentry->d_u.d_rcu);
else
call_rcu(&dentry->d_u.d_rcu, __d_free);
}
I also noticed that __dentry_kill() unlinks the child->d_u.child
under the parent->d_lock spin_lock.
Looking back at the loop in debugfs_remove_recursive() it never takes the
parent->d_lock to do the list walk. Adding more tracing, I was able to
prove this was the issue:
ftrace-t-15385 1.... 246662024us : dentry_kill <ffffffff81138b91>: free ffff88006d573600
rmdir-15409 2.... 246662024us : debugfs_remove_recursive <ffffffff811ec7e5>: child=ffff88006d573600 next=dead000000100058
The dentry_kill freed ffff88006d573600 just as the remove recursive was walking
it.
In order to fix this, the list walk needs to be modified a bit to take
the parent->d_lock. The safe version is no longer necessary, as every
time we remove a child, the parent->d_lock must be released and the
list walk must start over. Each time a child is removed, even though it
may still be on the list, it should be skipped by the first check
in the loop:
if (!debugfs_positive(child))
continue;
Cc: stable@vger.kernel.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Stable_kernel_rules should point submitters of network stable patches to the
netdev_FAQ.txt as requests for stable network patches should go to netdev
first.
Signed-off-by: Dave Chiluk <chiluk@canonical.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Needed by platform device drivers, such as the upcoming
vfio-platform driver, in order to bypass the existing OF, ACPI,
id_table and name string matches, and successfully be able to be
bound to any device, like so:
echo vfio-platform > /sys/bus/platform/devices/fff51000.ethernet/driver_override
echo fff51000.ethernet > /sys/bus/platform/devices/fff51000.ethernet/driver/unbind
echo fff51000.ethernet > /sys/bus/platform/drivers_probe
This mimics "PCI: Introduce new device binding path using
pci_dev.driver_override", which is an interface enhancement
for more deterministic PCI device binding, e.g., when in the
presence of hotplug.
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Up to 7 bytes are wasted at the end of struct platform_object
in the form of padding after name field: unfortunately this
padding is not used when allocating the memory to hold the
name.
This patch converts name array from name[1] to C99 flexible
array name[] (equivalent to name[0]) so that no padding is
required by the presence of this field. Memory allocation
is updated to take care of allocating an additional byte for
the NUL terminating character.
Built on Fedora 20, using GCC 4.8, for ARM, i386, SPARC64 and
x86_64 architectures, the data structure layout can be reported
with following command:
$ pahole drivers/base/platform.o \
--recursive \
--class_name device,pdev_archdata,platform_device,platform_object
Please find below some comparisons of structure layout for arm,
i386, sparc64 and x86_64 architecture before and after the patch.
--- obj-arm/drivers/base/platform.o.pahole.v3.15-rc7-79-gfe45736f4134 2014-05-30 10:32:06.290960701 +0200
+++ obj-arm/drivers/base/platform.o.pahole.v3.15-rc7-80-g2cdb06858d71 2014-05-30 11:26:20.851988347 +0200
@@ -81,10 +81,9 @@
/* XXX last struct has 4 bytes of padding */
/* --- cacheline 6 boundary (384 bytes) was 8 bytes ago --- */
- char name[1]; /* 392 1 */
+ char name[0]; /* 392 0 */
- /* size: 400, cachelines: 7, members: 2 */
- /* padding: 7 */
+ /* size: 392, cachelines: 7, members: 2 */
/* paddings: 1, sum paddings: 4 */
- /* last cacheline: 16 bytes */
+ /* last cacheline: 8 bytes */
};
--- obj-i386/drivers/base/platform.o.pahole.v3.15-rc7-79-gfe45736f4134 2014-05-30 10:32:06.305960691 +0200
+++ obj-i386/drivers/base/platform.o.pahole.v3.15-rc7-80-g2cdb06858d71 2014-05-30 11:26:20.875988332 +0200
@@ -73,9 +73,8 @@
struct platform_object {
struct platform_device pdev; /* 0 396 */
/* --- cacheline 6 boundary (384 bytes) was 12 bytes ago --- */
- char name[1]; /* 396 1 */
+ char name[0]; /* 396 0 */
- /* size: 400, cachelines: 7, members: 2 */
- /* padding: 3 */
- /* last cacheline: 16 bytes */
+ /* size: 396, cachelines: 7, members: 2 */
+ /* last cacheline: 12 bytes */
};
--- obj-sparc64/drivers/base/platform.o.pahole.v3.15-rc7-79-gfe45736f4134 2014-05-30 10:32:06.406960625 +0200
+++ obj-sparc64/drivers/base/platform.o.pahole.v3.15-rc7-80-g2cdb06858d71 2014-05-30 11:26:20.971988269 +0200
@@ -94,9 +94,8 @@
struct platform_object {
struct platform_device pdev; /* 0 2208 */
/* --- cacheline 34 boundary (2176 bytes) was 32 bytes ago --- */
- char name[1]; /* 2208 1 */
+ char name[0]; /* 2208 0 */
- /* size: 2216, cachelines: 35, members: 2 */
- /* padding: 7 */
- /* last cacheline: 40 bytes */
+ /* size: 2208, cachelines: 35, members: 2 */
+ /* last cacheline: 32 bytes */
};
--- obj-x86_64/drivers/base/platform.o.pahole.v3.15-rc7-79-gfe45736f4134 2014-05-30 10:32:06.432960608 +0200
+++ obj-x86_64/drivers/base/platform.o.pahole.v3.15-rc7-80-g2cdb06858d71 2014-05-30 11:26:21.000988250 +0200
@@ -84,9 +84,8 @@
struct platform_object {
struct platform_device pdev; /* 0 720 */
/* --- cacheline 11 boundary (704 bytes) was 16 bytes ago --- */
- char name[1]; /* 720 1 */
+ char name[0]; /* 720 0 */
- /* size: 728, cachelines: 12, members: 2 */
- /* padding: 7 */
- /* last cacheline: 24 bytes */
+ /* size: 720, cachelines: 12, members: 2 */
+ /* last cacheline: 16 bytes */
};
Changes from v5 [1]:
- dropped dma_mask allocation changes and only kept padding
removal changes (name array length set to 0).
Changes from v4 [2]:
[by Emil Goode <emilgoode@gmail.com>:]
- Split v4 of the patch into two separate patches.
- Generated new object file size and data structure layout info.
- Updated the changelog message.
Changes from v3 [3]:
- fixed commit message so that git am doesn't fail.
Changes from v2 [4]:
- move 'dma_mask' to platform_object so that it's always
allocated and won't leak on release; remove all previously
added support functions.
- use C99 flexible array member for 'name' to remove padding
at the end of platform_object.
Changes from v1 [5]:
- remove unneeded kfree() from error path
- add reference to author/commit adding allocation of dmamask
Changes from v0 [6]:
- small rewrite to squeeze the patch to a bare minimal
[1] http://lkml.kernel.org/r/1401122483-31603-2-git-send-email-emilgoode@gmail.com
http://lkml.kernel.org/r/1401122483-31603-1-git-send-email-emilgoode@gmail.com
http://lkml.kernel.org/r/1401122483-31603-3-git-send-email-emilgoode@gmail.com
[2] http://lkml.kernel.org/r/1390817152-30898-1-git-send-email-ydroneaud@opteya.com
https://patchwork.kernel.org/patch/3541871/
[3] http://lkml.kernel.org/r/1390771138-28348-1-git-send-email-ydroneaud@opteya.com
https://patchwork.kernel.org/patch/3540081/
[4] http://lkml.kernel.org/r/1389683909-17495-1-git-send-email-ydroneaud@opteya.com
https://patchwork.kernel.org/patch/3484411/
[5] http://lkml.kernel.org/r/1389649085-7365-1-git-send-email-ydroneaud@opteya.com
https://patchwork.kernel.org/patch/3480961/
[6] http://lkml.kernel.org/r/1386886207-2735-1-git-send-email-ydroneaud@opteya.com
Cc: Emil Goode <emilgoode@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Shawn Guo <shawn.guo@freescale.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Olof Johansson <olof@lixom.net>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Now that the udev firmware loader is optional request_firmware()
will not provide any information on the kernel ring buffer if
direct firmware loading failed and udev firmware loading is disabled.
If no information is needed request_firmware_direct() should be used
for optional firmware, at which point drivers can take on the onus
over informing of any failures, if udev firmware loading is disabled
though we should at the very least provide some sort of information
as when the udev loader was enabled by default back in the days.
With this change with a simple firmware load test module [0]:
Example output without FW_LOADER_USER_HELPER_FALLBACK
platform fake-dev.0: Direct firmware load for fake.bin failed
with error -2
Example with FW_LOADER_USER_HELPER_FALLBACK
platform fake-dev.0: Direct firmware load for fake.bin failed with error -2
platform fake-dev.0: Falling back to user helper
Without this change without FW_LOADER_USER_HELPER_FALLBACK we
get no output logged upon failure.
Cc: Tom Gundersen <teg@jklm.no>
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Abhay Salunke <Abhay_Salunke@dell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Kay Sievers <kay@vrfy.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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use mm.h definition
Cc: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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There is no need to read attr because inode structure contains size
of the file. Use i_size_read() instead.
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Acked-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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[The patch was originally proposed by Tom Gundersen, and rewritten
afterwards by me; most of changelogs below borrowed from Tom's
original patch -- tiwai]
Currently (at least) the dell-rbu driver selects FW_LOADER_USER_HELPER,
which means that distros can't really stop loading firmware through
udev without breaking other users (though some have).
Ideally we would remove/disable the udev firmware helper in both the
kernel and in udev, but if we were to disable it in udev and not the
kernel, the result would be (seemingly) hung kernels as no one would
be around to cancel firmware requests.
This patch allows udev firmware loading to be disabled while still
allowing non-udev firmware loading, as done by the dell-rbu driver, to
continue working. This is achieved by only using the fallback
mechanism when the uevent is suppressed.
The patch renames the user-selectable Kconfig from FW_LOADER_USER_HELPER
to FW_LOADER_USER_HELPER_FALLBACK, and the former is reverse-selected
by the latter or the drivers that need userhelper like dell-rbu.
Also, the "default y" is removed together with this change, since it's
been deprecated in udev upstream, thus rather better to disable it
nowadays.
Tested with
FW_LOADER_USER_HELPER=n
LATTICE_ECP3_CONFIG=y
DELL_RBU=y
and udev without the firmware loading support, but I don't have the
hardware to test the lattice/dell drivers, so additional testing would
be appreciated.
Reviewed-by: Tom Gundersen <teg@jklm.no>
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Abhay Salunke <Abhay_Salunke@dell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Kay Sievers <kay@vrfy.org>
Tested-by: Balaji Singh <B_B_Singh@DELL.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This adds some extra functions to deal with rcu.
reservation_object_get_fences_rcu() will obtain the list of shared
and exclusive fences without obtaining the ww_mutex.
reservation_object_wait_timeout_rcu() will wait on all fences of the
reservation_object, without obtaining the ww_mutex.
reservation_object_test_signaled_rcu() will test if all fences of the
reservation_object are signaled without using the ww_mutex.
reservation_object_get_excl and reservation_object_get_list require
the reservation object to be held, updating requires
write_seqcount_begin/end. If only the exclusive fence is needed,
rcu_dereference followed by fence_get_rcu can be used, if the shared
fences are needed it's recommended to use the supplied functions.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-By: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Move the list of shared fences to a struct, and return it in
reservation_object_get_list().
Add reservation_object_get_excl to get the exclusive fence.
Add reservation_object_reserve_shared(), which reserves space
in the reservation_object for 1 more shared fence.
reservation_object_add_shared_fence() and
reservation_object_add_excl_fence() are used to assign a new
fence to a reservation_object pointer, to complete a reservation.
Changes since v1:
- Add reservation_object_get_excl, reorder code a bit.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Thanks to Fengguang Wu for spotting a missing static cast.
v2:
- Kill unused variable need_shared.
v3:
- Clarify the BUG() in dma_buf_release some more. (Rob Clark)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Just to show it's easy.
Android syncpoints can be mapped to a timeline. This removes the need
to maintain a separate api for synchronization. I've left the android
trace events in place, but the core fence events should already be
sufficient for debugging.
v2:
- Call fence_remove_callback in sync_fence_free if not all fences have fired.
v3:
- Merge Colin Cross' bugfixes, and the android fence merge optimization.
v4:
- Merge with the upstream fixes.
v5:
- Fix small style issues pointed out by Thomas Hellstrom.
v6:
- Fix for updates to fence api.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This allows reservation objects to be used in dma-buf. it's required
for implementing polling support on the fences that belong to a dma-buf.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Mauro Carvalho Chehab <m.chehab@samsung.com> #drivers/media/v4l2-core/
Acked-by: Thomas Hellstrom <thellstrom@vmware.com> #drivers/gpu/drm/ttm
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net> #drivers/gpu/drm/armada/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This type of fence can be used with hardware synchronization for simple
hardware that can block execution until the condition
(dma_buf[offset] - value) >= 0 has been met when WAIT_GEQUAL is used,
or (dma_buf[offset] != 0) has been met when WAIT_NONZERO is set.
A software fallback still has to be provided in case the fence is used
with a device that doesn't support this mechanism. It is useful to expose
this for graphics cards that have an op to support this.
Some cards like i915 can export those, but don't have an option to wait,
so they need the software fallback.
I extended the original patch by Rob Clark.
v1: Original
v2: Renamed from bikeshed to seqno, moved into dma-fence.c since
not much was left of the file. Lots of documentation added.
v3: Use fence_ops instead of custom callbacks. Moved to own file
to avoid circular dependency between dma-buf.h and fence.h
v4: Add spinlock pointer to seqno_fence_init
v5: Add condition member to allow wait for != 0.
Fix small style errors pointed out by checkpatch.
v6: Move to a separate file. Fix up api changes in fences.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com> #v4
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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A fence can be attached to a buffer which is being filled or consumed
by hw, to allow userspace to pass the buffer without waiting to another
device. For example, userspace can call page_flip ioctl to display the
next frame of graphics after kicking the GPU but while the GPU is still
rendering. The display device sharing the buffer with the GPU would
attach a callback to get notified when the GPU's rendering-complete IRQ
fires, to update the scan-out address of the display, without having to
wake up userspace.
A driver must allocate a fence context for each execution ring that can
run in parallel. The function for this takes an argument with how many
contexts to allocate:
+ fence_context_alloc()
A fence is transient, one-shot deal. It is allocated and attached
to one or more dma-buf's. When the one that attached it is done, with
the pending operation, it can signal the fence:
+ fence_signal()
To have a rough approximation whether a fence is fired, call:
+ fence_is_signaled()
The dma-buf-mgr handles tracking, and waiting on, the fences associated
with a dma-buf.
The one pending on the fence can add an async callback:
+ fence_add_callback()
The callback can optionally be cancelled with:
+ fence_remove_callback()
To wait synchronously, optionally with a timeout:
+ fence_wait()
+ fence_wait_timeout()
When emitting a fence, call:
+ trace_fence_emit()
To annotate that a fence is blocking on another fence, call:
+ trace_fence_annotate_wait_on(fence, on_fence)
A default software-only implementation is provided, which can be used
by drivers attaching a fence to a buffer when they have no other means
for hw sync. But a memory backed fence is also envisioned, because it
is common that GPU's can write to, or poll on some memory location for
synchronization. For example:
fence = custom_get_fence(...);
if ((seqno_fence = to_seqno_fence(fence)) != NULL) {
dma_buf *fence_buf = seqno_fence->sync_buf;
get_dma_buf(fence_buf);
... tell the hw the memory location to wait ...
custom_wait_on(fence_buf, seqno_fence->seqno_ofs, fence->seqno);
} else {
/* fall-back to sw sync * /
fence_add_callback(fence, my_cb);
}
On SoC platforms, if some other hw mechanism is provided for synchronizing
between IP blocks, it could be supported as an alternate implementation
with it's own fence ops in a similar way.
enable_signaling callback is used to provide sw signaling in case a cpu
waiter is requested or no compatible hardware signaling could be used.
The intention is to provide a userspace interface (presumably via eventfd)
later, to be used in conjunction with dma-buf's mmap support for sw access
to buffers (or for userspace apps that would prefer to do their own
synchronization).
v1: Original
v2: After discussion w/ danvet and mlankhorst on #dri-devel, we decided
that dma-fence didn't need to care about the sw->hw signaling path
(it can be handled same as sw->sw case), and therefore the fence->ops
can be simplified and more handled in the core. So remove the signal,
add_callback, cancel_callback, and wait ops, and replace with a simple
enable_signaling() op which can be used to inform a fence supporting
hw->hw signaling that one or more devices which do not support hw
signaling are waiting (and therefore it should enable an irq or do
whatever is necessary in order that the CPU is notified when the
fence is passed).
v3: Fix locking fail in attach_fence() and get_fence()
v4: Remove tie-in w/ dma-buf.. after discussion w/ danvet and mlankorst
we decided that we need to be able to attach one fence to N dma-buf's,
so using the list_head in dma-fence struct would be problematic.
v5: [ Maarten Lankhorst ] Updated for dma-bikeshed-fence and dma-buf-manager.
v6: [ Maarten Lankhorst ] I removed dma_fence_cancel_callback and some comments
about checking if fence fired or not. This is broken by design.
waitqueue_active during destruction is now fatal, since the signaller
should be holding a reference in enable_signalling until it signalled
the fence. Pass the original dma_fence_cb along, and call __remove_wait
in the dma_fence_callback handler, so that no cleanup needs to be
performed.
v7: [ Maarten Lankhorst ] Set cb->func and only enable sw signaling if
fence wasn't signaled yet, for example for hardware fences that may
choose to signal blindly.
v8: [ Maarten Lankhorst ] Tons of tiny fixes, moved __dma_fence_init to
header and fixed include mess. dma-fence.h now includes dma-buf.h
All members are now initialized, so kmalloc can be used for
allocating a dma-fence. More documentation added.
v9: Change compiler bitfields to flags, change return type of
enable_signaling to bool. Rework dma_fence_wait. Added
dma_fence_is_signaled and dma_fence_wait_timeout.
s/dma// and change exports to non GPL. Added fence_is_signaled and
fence_enable_sw_signaling calls, add ability to override default
wait operation.
v10: remove event_queue, use a custom list, export try_to_wake_up from
scheduler. Remove fence lock and use a global spinlock instead,
this should hopefully remove all the locking headaches I was having
on trying to implement this. enable_signaling is called with this
lock held.
v11:
Use atomic ops for flags, lifting the need for some spin_lock_irqsaves.
However I kept the guarantee that after fence_signal returns, it is
guaranteed that enable_signaling has either been called to completion,
or will not be called any more.
Add contexts and seqno to base fence implementation. This allows you
to wait for less fences, by testing for seqno + signaled, and then only
wait on the later fence.
Add FENCE_TRACE, FENCE_WARN, and FENCE_ERR. This makes debugging easier.
An CONFIG_DEBUG_FENCE will be added to turn off the FENCE_TRACE
spam, and another runtime option can turn it off at runtime.
v12:
Add CONFIG_FENCE_TRACE. Add missing documentation for the fence->context
and fence->seqno members.
v13:
Fixup CONFIG_FENCE_TRACE kconfig description.
Move fence_context_alloc to fence.
Simplify fence_later.
Kill priv member to fence_cb.
v14:
Remove priv argument from fence_add_callback, oops!
v15:
Remove priv from documentation.
Explicitly include linux/atomic.h.
v16:
Add trace events.
Import changes required by android syncpoints.
v17:
Use wake_up_state instead of try_to_wake_up. (Colin Cross)
Fix up commit description for seqno_fence. (Rob Clark)
v18:
Rename release_fence to fence_release.
Move to drivers/dma-buf/.
Rename __fence_is_signaled and __fence_signal to *_locked.
Rename __fence_init to fence_init.
Make fence_default_wait return a signed long, and fix wait ops too.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com> #use smp_mb__before_atomic()
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://ftp.arm.linux.org.uk/~rmk/linux-arm into work-next
Russell writes:
Greg,
Please incorporate a fix for the component helper.
This fixes a bug reported by Sachin Kamat found with Exynos DRM.
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Sachin Kamat reports that "component: add support for component match
array" broke Exynos DRM due to a NULL pointer deref. Fix this.
Reported-by: Sachin Kamat <sachin.kamat@samsung.com>
Tested-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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We want the lz* fixes here to do more work with them.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Pull devicetree bugfix from Grant Likely:
"Important bug fix for parsing 64-bit addresses on 32-bit platforms.
Without this patch the kernel will try to use memory ranges that
cannot be reached"
* tag 'dt-for-linus' of git://git.secretlab.ca/git/linux:
of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch
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The common early_init_dt_add_memory_arch takes the base and size
of a memory region as u64 types. The function never checks if
the base and size can actually fit in a phys_addr_t which may
be smaller than 64-bits. This may result in incorrect memory
being passed to memblock_add if the memory falls outside the
range of phys_addr_t. Add range checks for the base and size if
phys_addr_t is smaller than u64.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"This is a set of 13 fixes, a MAINTAINERS update and a sparse update.
The fixes are mostly correct value initialisations, avoiding NULL
derefs and some uninitialised pointer avoidance.
All the patches have been incubated in -next for a few days. The
final patch (use the scsi data buffer length to extract transfer size)
has been rebased to add a cc to stable, but only the commit message
has changed"
* tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
[SCSI] use the scsi data buffer length to extract transfer size
virtio-scsi: fix various bad behavior on aborted requests
virtio-scsi: avoid cancelling uninitialized work items
ibmvscsi: Add memory barriers for send / receive
ibmvscsi: Abort init sequence during error recovery
qla2xxx: Fix sparse warning in qla_target.c.
bnx2fc: Improve stats update mechanism
bnx2fc: do not scan uninitialized lists in case of error.
fc: ensure scan_work isn't active when freeing fc_rport
pm8001: Fix potential null pointer dereference and memory leak.
MAINTAINERS: Update LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) maintainers Email IDs
be2iscsi: remove potential junk pointer free
be2iscsi: add an missing goto in error path
scsi_error: set DID_TIME_OUT correctly
scsi_error: fix invalid setting of host byte
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Even though the virtio-scsi spec guarantees that all requests related
to the TMF will have been completed by the time the TMF itself completes,
the request queue's callback might not have run yet. This causes requests
to be completed more than once, and as a result triggers a variety of
BUGs or oopses.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Venkatesh Srinivas <venkateshs@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Calling the workqueue interface on uninitialized work items isn't a
good idea even if they're zeroed. It's not failing catastrophically only
through happy accidents.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Add a memory barrier prior to sending a new command to the VIOS
to ensure the VIOS does not receive stale data in the command buffer.
Also add a memory barrier when processing the CRQ for completed commands.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
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If a CRQ reset is triggered for some reason while in the middle
of performing VSCSI adapter initialization, we don't want to
call the done function for the initialization MAD commands as
this will only result in two threads attempting initialization
at the same time, resulting in failures.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Recently had this warning reported:
[ 290.489047] Call Trace:
[ 290.489053] [<ffffffff8169efec>] dump_stack+0x19/0x1b
[ 290.489055] [<ffffffff810ac7a9>] __might_sleep+0x179/0x230
[ 290.489057] [<ffffffff816a4ad5>] mutex_lock_nested+0x55/0x520
[ 290.489061] [<ffffffffa01b9905>] ? bnx2fc_l2_rcv_thread+0xc5/0x4c0 [bnx2fc]
[ 290.489065] [<ffffffffa0174c1a>] fc_vport_id_lookup+0x3a/0xa0 [libfc]
[ 290.489068] [<ffffffffa01b9a6c>] bnx2fc_l2_rcv_thread+0x22c/0x4c0 [bnx2fc]
[ 290.489070] [<ffffffffa01b9840>] ? bnx2fc_vport_destroy+0x110/0x110 [bnx2fc]
[ 290.489073] [<ffffffff8109e0cd>] kthread+0xed/0x100
[ 290.489075] [<ffffffff8109dfe0>] ? insert_kthread_work+0x80/0x80
[ 290.489077] [<ffffffff816b2fec>] ret_from_fork+0x7c/0xb0
[ 290.489078] [<ffffffff8109dfe0>] ? insert_kthread_work+0x80/0x80
Its due to the fact that we call a potentially sleeping function from the bnx2fc
rcv path with preemption disabled (via the get_cpu call embedded in the per-cpu
variable stats lookup in bnx2fc_l2_rcv_thread.
Easy enough fix, we can just move the stats collection later in the function
where we are sure we won't preempt or sleep. This also allows us to not have to
enable pre-emption when doing a per-cpu lookup, since we're certain not to get
rescheduled.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Eddie Wai <eddie.wai@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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In case of of error, the bnx2fc_cmd_mgr_alloc() function will call
the bnx2fc_cmd_mgr_free() to perform the cleanup.
The problem is that in one case the latter may try to scan
some not-yet initialized lists, resulting in a kernel panic.
This patch prevents this from happening by freeing the lists
before calling bnx2fc_cmd_mgr_free().
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Acked-by: Eddie Wai <eddie.wai@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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debugfs caught this:
WARNING: at lib/debugobjects.c:260 debug_print_object+0x83/0xa0()
ODEBUG: free active (active state 0) object type: work_struct
hint: fc_scsi_scan_rport+0x0/0xd0 [scsi_transport_fc]
CPU: 1 PID: 184 Comm: kworker/1:1 Tainted: G W
-------------- 3.10.0-123.el7.x86_64.debug #1
Hardware name: HP ProLiant DL120 G7, BIOS J01 07/01/2013
Workqueue: fc_wq_5 fc_rport_final_delete [scsi_transport_fc]
Call Trace:
[<ffffffff8169efec>] dump_stack+0x19/0x1b
[<ffffffff8106cbd1>] warn_slowpath_common+0x61/0x80
[<ffffffff8106cc4c>] warn_slowpath_fmt+0x5c/0x80
[<ffffffff8133e003>] debug_print_object+0x83/0xa0
[<ffffffffa04e2f40>] ? fc_parse_wwn+0x100/0x100
[<ffffffff8133f23b>] debug_check_no_obj_freed+0x22b/0x270
[<ffffffffa04e127e>] ? fc_rport_dev_release+0x1e/0x30
[<ffffffff811db3e9>] kfree+0xd9/0x2d0
[<ffffffffa04e127e>] fc_rport_dev_release+0x1e/0x30
[<ffffffff81428032>] device_release+0x32/0xa0
[<ffffffff8132701e>] kobject_release+0x7e/0x1b0
[<ffffffff81326ed8>] kobject_put+0x28/0x60
[<ffffffff81428397>] put_device+0x17/0x20
[<ffffffffa04e5025>] fc_rport_final_delete+0x165/0x210
[<ffffffff810959b0>] process_one_work+0x220/0x710
[<ffffffff81095944>] ? process_one_work+0x1b4/0x710
[<ffffffff81095fbb>] worker_thread+0x11b/0x3a0
[<ffffffff81095ea0>] ? process_one_work+0x710/0x710
[<ffffffff8109e0cd>] kthread+0xed/0x100
[<ffffffff8109dfe0>] ? insert_kthread_work+0x80/0x80
[<ffffffff816b2fec>] ret_from_fork+0x7c/0xb0
[<ffffffff8109dfe0>] ? insert_kthread_work+0x80/0x80
Seems to be because the scan_work work_struct might be active when the housing
fc_rport struct gets freed. Ensure that we cancel it prior to freeing the rport
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reviewed-by: Vasu Dev <vasu.dev@intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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The pm8001_get_phy_settings_info() function does not check
the kzalloc() return value and does not free the allocated memory.
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Acked-by: Suresh Thiagarajan <Suresh.Thiagarajan@pmcs.com>
Acked-by: Jack Wang <xjtuwjp@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Email IDs
Updating maintainers Email Ids for the entry LSILOGIC MPT FUSION DRIVERS in
MAINTAINERS file
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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commit 0e7c60c [SCSI] be2iscsi: fix memory leak in error path
fixed an potential junk pointer free if mgmt_get_if_info() returned an error
fix it on one more place
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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a jump to 'free_memory' is apparently missing
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Commit 8846bab180fa introduced a helper that can be used to query the
wire transfer size for a SCSI command taking protection information into
account.
However, some commands do not have a 1:1 mapping between the block range
they work on and the payload size (discard, write same). After the
scatterlist has been set up these requests use __data_len to store the
number of bytes to report completion on. This means that callers of
scsi_transfer_length() would get the wrong byte count for these types of
requests.
To overcome this we make scsi_transfer_length() use the scatterlist
length in the scsi_data_buffer as basis for the wire transfer
calculation instead of __data_len.
Reported-by: Christoph Hellwig <hch@infradead.org>
Debugged-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Fixes: d77e65350f2d82dfa0557707d505711f5a43c8fd
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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Any callbacks in scsi_timeout_out() might return BLK_EH_RESET_TIMER,
in which case we should leave the result alone and not set
DID_TIME_OUT, as the command didn't actually timeout.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
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After scsi_try_to_abort_cmd returns, the eh_abort_handler may have
already found that the command has completed in the device, causing
the host_byte to be nonzero (e.g. it could be DID_ABORT). When
this happens, ORing DID_TIME_OUT into the host byte will corrupt
the result field and initiate an unwanted command retry.
Fix this by using set_host_byte instead, following the model of
commit 2082ebc45af9c9c648383b8cde0dc1948eadbf31.
Cc: stable@vger.kernel.org
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
[Fix all instances according to review comments. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
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Pull drm fixes from Dave Airlie:
"i915, tda998x and vmwgfx fixes,
The main one is i915 fix for missing VGA connectors, along with some
fixes for the tda998x from Russell fixing some modesetting problems.
(still on holidays, but got a spare moment to find these)"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/vmwgfx: Fix incorrect write to read-only register v2:
drm/i915: Drop early VLV WA to fix Voltage not getting dropped to Vmin
drm/i915: only apply crt_present check on VLV
drm/i915: Wait for vblank after enabling the primary plane on BDW
drm/i2c: tda998x: add some basic mode validation
drm/i2c: tda998x: faster polling for edid
drm/i2c: tda998x: move drm_i2c_encoder_destroy call
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git://anongit.freedesktop.org/drm-intel
Fixes for 3.16-rc3; most importantly Jesse brings back VGA he took away
on a bunch of machines. Also a vblank fix for BDW and a power workaround
fix for VLV.
* tag 'drm-intel-fixes-2014-07-03' of git://anongit.freedesktop.org/drm-intel:
drm/i915: Drop early VLV WA to fix Voltage not getting dropped to Vmin
drm/i915: only apply crt_present check on VLV
drm/i915: Wait for vblank after enabling the primary plane on BDW
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Drop WA to fix Voltage not getting dropped to Vmin when Gfx is power
gated for latest VLV revision.
Workaround fixed in Latest VLV revision. Forcing Gfx clk up not needed,
and Requesting the min freq should bring bring the voltage Vnn.
v2: Drop WA for Latest VLV revision (Ville)
Signed-off-by: Deepak S <deepak.s@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[Jani: modified code comment, reformatted the commit message a bit.]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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