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authorHua Zhong <hzhong@gmail.com>2006-10-03 01:14:15 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-03 08:04:07 -0700
commitce42f19137225d01be9388a73703df40fb7af80f (patch)
tree16d9b0bc3a5bd30c69b03836d44c1db4338628c4 /drivers/ide
parentdc844e05913b84d09e86d88c0f861ef0afbee2fd (diff)
[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>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-io.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 38479a29d3e..8d26619ba16 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -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;