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[PATCH] IDE error handling fixes 

In 2.6.15.1 I encountered some IDE crashes when unplugging IDE cables to
emulate disk errors.  Below is a patch against 2.6.16 which I think still
applies.

1.  The first BUG_ON could trigger when a PREFLUSH IO fails (it would
   fail the original barrier request which hasn't been marked REQ_STARTED
   yet).

2. the rq could have been dequeued already (same as 1).

3.  HWGROUP(drive)->rq could be NULL because of the ide_error() several
   lines earlier.

Signed-off-by: Hua Zhong <hzhong@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hua Zhong 2006-10-03 01:14:15 -07:00 committed by Linus Torvalds
parent dc844e0591
commit ce42f19137
1 changed files with 6 additions and 3 deletions
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9
drivers/ide/ide-io.c
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@ -59,8 +59,6 @@ static int __ide_end_request(ide_drive_t *drive, struct request *rq,
{
int ret = 1;
BUG_ON(!blk_rq_started(rq));
/*
* if failfast is set on a request, override number of sectors and
* complete the whole request right now
@ -82,7 +80,8 @@ static int __ide_end_request(ide_drive_t *drive, struct request *rq,
if (!end_that_request_first(rq, uptodate, nr_sectors)) {
add_disk_randomness(rq->rq_disk);
blkdev_dequeue_request(rq);
if (!list_empty(&rq->queuelist))
blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
end_that_request_last(rq, uptodate);
ret = 0;
@ -1346,6 +1345,10 @@ static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
* make sure request is sane
*/
rq = HWGROUP(drive)->rq;
if (!rq)
goto out;
HWGROUP(drive)->rq = NULL;
rq->errors = 0;