Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=395d8ef5bebe547a80737692f9789d2e36da16f2
Commit: 395d8ef5bebe547a80737692f9789d2e36da16f2
Parent: 8e882ba111bb52fbb42c34a265afb97ddd4fcea1
Author: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 11 00:32:14 2008 +0100
Committer: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
CommitDate: Mon Feb 11 00:32:14 2008 +0100
ide-disk: fix flush requests (take 2)
commit 813a0eb233ee67d7166241a8b389b6a76f2247f9
Author: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Cc: Christoph Hellwig <[EMAIL PROTECTED]>
Cc: James Bottomley <[EMAIL PROTECTED]>
Cc: Jens Axboe <[EMAIL PROTECTED]>
Cc: Tejun Heo <[EMAIL PROTECTED]>
Cc: Sergei Shtylyov <[EMAIL PROTECTED]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
---
drivers/ide/ide-disk.c | 18 +++++++++++-------
drivers/ide/ide-io.c | 16 ++++++++++------
include/linux/ide.h | 2 ++
3 files changed, 23 insertions(+), 13 deletions(-)
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 3c69822..aed8b31 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -590,20 +590,24 @@ static ide_proc_entry_t idedisk_proc[] = {
static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
{
ide_drive_t *drive = q->queuedata;
- ide_task_t task;
+ ide_task_t *task = kmalloc(sizeof(*task), GFP_ATOMIC);
- memset(&task, 0, sizeof(task));
+ /* FIXME: map struct ide_taskfile on rq->cmd[] */
+ BUG_ON(task == NULL);
+
+ memset(task, 0, sizeof(*task));
if (ide_id_has_flush_cache_ext(drive->id) &&
(drive->capacity64 >= (1UL << 28)))
- task.tf.command = WIN_FLUSH_CACHE_EXT;
+ task->tf.command = WIN_FLUSH_CACHE_EXT;
else
- task.tf.command = WIN_FLUSH_CACHE;
- task.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE;
- task.data_phase = TASKFILE_NO_DATA;
+ task->tf.command = WIN_FLUSH_CACHE;
+ task->tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE |
+ IDE_TFLAG_DYN;
+ task->data_phase = TASKFILE_NO_DATA;
rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
rq->cmd_flags |= REQ_SOFTBARRIER;
- rq->special = &task;
+ rq->special = task;
}
/*
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index e41383f..7153796 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -361,17 +361,21 @@ void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8
err)
spin_unlock_irqrestore(&ide_lock, flags);
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
- ide_task_t *args = (ide_task_t *) rq->special;
+ ide_task_t *task = (ide_task_t *)rq->special;
+
if (rq->errors == 0)
- rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
-
- if (args) {
- struct ide_taskfile *tf = &args->tf;
+ rq->errors = !OK_STAT(stat, READY_STAT, BAD_STAT);
+
+ if (task) {
+ struct ide_taskfile *tf = &task->tf;
tf->error = err;
tf->status = stat;
- ide_tf_read(drive, args);
+ ide_tf_read(drive, task);
+
+ if (task->tf_flags & IDE_TFLAG_DYN)
+ kfree(task);
}
} else if (blk_pm_request(rq)) {
struct request_pm_state *pm = rq->data;
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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