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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-02-11 00:32:14 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-02-11 00:32:14 +0100
commit395d8ef5bebe547a80737692f9789d2e36da16f2 (patch)
treedc0ef3062f1377137ce1f60fa14f7e7ea20ee372 /include
parent8e882ba111bb52fbb42c34a265afb97ddd4fcea1 (diff)
downloadop-kernel-dev-395d8ef5bebe547a80737692f9789d2e36da16f2.zip
op-kernel-dev-395d8ef5bebe547a80737692f9789d2e36da16f2.tar.gz
ide-disk: fix flush requests (take 2)
commit 813a0eb233ee67d7166241a8b389b6a76f2247f9 Author: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Date: Fri Jan 25 22:17:10 2008 +0100 ide: switch idedisk_prepare_flush() to use REQ_TYPE_ATA_TASKFILE requests ... broke flush requests. Allocating IDE command structure on the stack for flush requests is not a very brilliant idea: - idedisk_prepare_flush() only prepares the request and it doesn't wait for it to be completed - there are can be multiple flush requests queued in the queue Fix the problem (per hints from James Bottomley) by: - dynamically allocating ide_task_t instance using kmalloc(..., GFP_ATOMIC) - adding new taskfile flag (IDE_TFLAG_DYN) - calling kfree() in ide_end_drive_command() if IDE_TFLAG_DYN is set (while at it rename 'args' to 'task' and fix whitespace damage) [ This will be fixed properly before 2.6.25 but this bug is rather critical and the proper solution requires some more work + testing. ] Thanks to Sebastian Siewior and Christoph Hellwig for reporting the problem and testing patches (extra thanks to Sebastian for bisecting it to the guilty commmit). Tested-by: Sebastian Siewior <ide-bug@ml.breakpoint.cc> Cc: Christoph Hellwig <hch@infradead.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Tejun Heo <htejun@gmail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ide.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 40a01c3..23fad89 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -906,6 +906,8 @@ enum {
IDE_TFLAG_IN_DEVICE,
/* force 16-bit I/O operations */
IDE_TFLAG_IO_16BIT = (1 << 30),
+ /* ide_task_t was allocated using kmalloc() */
+ IDE_TFLAG_DYN = (1 << 31),
};
struct ide_taskfile {
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