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* Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6Linus Torvalds2008-10-201-6/+8
|\ | | | | | | | | * 'bkl-removal' of git://git.lwn.net/linux-2.6: UIO: BKL removal
| * UIO: BKL removalJonathan Corbet2008-10-161-6/+8
| | | | | | | | | | | | | | | | | | | | Fill in needed locking around idr accesses, then remove the big kernel lock from the UIO driver. Since there are no in-tree UIO drivers with open() methods, no further BKL pushdown is required. Acked-by: Hans J. Koch <hjk@linutronix.de> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* | UIO: Fix mapping of logical and virtual memoryAndrew G. Harvey2008-10-161-2/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | mmap() doesn't work as expected for UIO_MEM_LOGICAL or UIO_MEM_VIRTUAL mappings. The offset into the memory needs to be added, otherwise uio_vma_fault always returns the first page only. Note that for UIO userspace calls mmap() with offset = N * getpagesize() to access mapping N. This must be compensated when calculating the offset. A comment was added to explain this since it is not obvious. Signed-off-by: Andrew G. Harvey <agh@cisco.com> Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | UIO: Add alignment warnings for uio-memHans J. Koch2008-10-161-0/+8
| | | | | | | | | | | | | | | | | | | | This patch adds an "offset" attribute for UIO mappings. It shows the difference between the actual start address of the memory and the start address of the page. Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | device create: misc: convert device_create_drvdata to device_createGreg Kroah-Hartman2008-10-161-3/+3
|/ | | | | | | | Now that device_create() has been audited, rename things back to the original call to be sane. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UIO: Add write function to allow irq maskingHans J. Koch2008-07-211-0/+26
| | | | | | | | | | | | | | Sometimes it is necessary to enable/disable the interrupt of a UIO device from the userspace part of the driver. With this patch, the UIO kernel driver can implement an "irqcontrol()" function that does this. Userspace can write an s32 value to /dev/uioX (usually 0 or 1 to turn the irq off or on). The UIO core will then call the driver's irqcontrol function. Signed-off-by: Hans J. Koch <hjk@linutronix.de> Acked-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Acked-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Merge commit 'v2.6.26' into bkl-removalJonathan Corbet2008-07-141-4/+3
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| * UIO: fix race in device_createGreg Kroah-Hartman2008-05-201-4/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a race from when a device is created with device_create() and then the drvdata is set with a call to dev_set_drvdata() in which a sysfs file could be open, yet the drvdata will be NULL, causing all sorts of bad things to happen. This patch fixes the problem by using the new function, device_create_drvdata(). Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | UIO: cdev lock_kernel() pushdownJonathan Corbet2008-06-201-5/+12
|/ | | | Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* UIO: hold a reference to the device's owner while the device is openUwe Kleine-König2008-04-191-15/+21
| | | | | | | | | | Otherwise the device might just disappear while /dev/uioX is being used which results in an Oops. Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Signed-off-by: Hans J Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UIO: add pgprot_noncached() to UIO mmap codeJean-Samuel Chenard2008-03-241-0/+2
| | | | | | | | | | | | Mapping of physical memory in UIO needs pgprot_noncached() to ensure that IO memory is not cached. Without pgprot_noncached(), it (accidentally) works on x86 and arm, but fails on PPC. Signed-off-by: Jean-Samuel Chenard <jsamch@gmail.com> Signed-off-by: Hans J Koch <hjk@linutronix.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UIO: fix Greg's stupid changesBrandon Philips2008-02-211-17/+37
| | | | | | | | | | | | | | | | | This fixes two bugs with UIO that cropped up recently in -rc1 1) WARNING: at fs/sysfs/file.c:334 sysfs_open_file when trying to open a map addr/size file - complaining about missing sysfs_ops for ktype 2) Permission denied when reading uio/uio0/maps/map0/{addr,size} when files are mode S_IRUGO Also fix a typo: attr_attribute -> addr_attribute Signed-off-by: Brandon Philips <bphilips@suse.de> Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* uio: nopageNick Piggin2008-02-061-8/+6
| | | | | | | | | Convert uio from nopage to fault. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Hans J Koch <hjk@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* UIO: constify function pointer tablesJan Engelhardt2008-01-241-2/+2
| | | | | | Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Kobject: convert drivers/* from kobject_unregister() to kobject_put()Greg Kroah-Hartman2008-01-241-4/+4
| | | | | | | | | | | There is no need for kobject_unregister() anymore, thanks to Kay's kobject cleanup changes, so replace all instances of it with kobject_put(). Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Kobject: rename kobject_init_ng() to kobject_init()Greg Kroah-Hartman2008-01-241-1/+1
| | | | | | | | | Now that the old kobject_init() function is gone, rename kobject_init_ng() to kobject_init() to clean up the namespace. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Kobject: rename kobject_add_ng() to kobject_add()Greg Kroah-Hartman2008-01-241-1/+1
| | | | | | | | | Now that the old kobject_add() function is gone, rename kobject_add_ng() to kobject_add() to clean up the namespace. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UIO: fix kobject usageGreg Kroah-Hartman2008-01-241-43/+48
| | | | | | | | | | | | | The uio kobject code is "wierd". This patch should hopefully fix it up to be sane and not leak memory anymore. Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Benedikt Spranger <b.spranger@linutronix.de> Signed-off-by: Hans J. Koch <hjk@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* kobject: remove struct kobj_type from struct ksetGreg Kroah-Hartman2008-01-241-1/+1
| | | | | | | | | | | | | | | | | We don't need a "default" ktype for a kset. We should set this explicitly every time for each kset. This change is needed so that we can make ksets dynamic, and cleans up one of the odd, undocumented assumption that the kset/kobject/ktype model has. This patch is based on a lot of help from Kay Sievers. Nasty bug in the block code was found by Dave Young <hidave.darkstar@gmail.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* UIO: Add the User IO core codeHans J. Koch2007-07-181-0/+701
This interface allows the ability to write the majority of a driver in userspace with only a very small shell of a driver in the kernel itself. It uses a char device and sysfs to interact with a userspace process to process interrupts and control memory accesses. See the docbook documentation for more details on how to use this interface. From: Hans J. Koch <hjk@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Benedikt Spranger <b.spranger@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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