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ide-disk: fix flush requests (take 2)

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commit 813a0eb233
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>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2008-02-11 00:32:14 +01:00
parent 8e882ba111
commit 395d8ef5be
3 changed files with 23 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/ide/ide-disk.c
+11 -7
View File
@@ -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;
}
/*