Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=95543179f158b4891c5dc49004853ce081e8d794 Commit: 95543179f158b4891c5dc49004853ce081e8d794 Parent: 3a7122923e87fc5cdf8affa1845924a0def4657d Author: Linas Vepstas <[EMAIL PROTECTED]> AuthorDate: Tue Jan 23 19:40:54 2007 +0100 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Tue Jan 23 11:01:17 2007 -0800
[PATCH] elevator: move clearing of unplug flag earlier A flag was recently added to the elevator code to avoid performing an unplug when reuests are being re-queued. The goal of this flag was to avoid a deep recursion that can occur when re-queueing requests after a SCSI device/host reset. See http://lkml.org/lkml/2006/5/17/254 However, that fix added the flag near the bottom of a case statement, where an earlier break (in an if statement) could transport one out of the case, without setting the flag. This patch sets the flag earlier in the case statement. I re-discovered the deep recursion recently during testing; I was told that it was a known problem, and the fix to it was in the kernel I was testing. Indeed it was ... but it didn't fix the bug. With the patch below, I no longer see the bug. Signed-off by: Linas Vepstas <[EMAIL PROTECTED]> Signed-off-by: Jens Axboe <[EMAIL PROTECTED]> Cc: Chris Wright <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- block/elevator.c | 11 ++++++----- 1 files changed, 6 insertions(+), 5 deletions(-) diff --git a/block/elevator.c b/block/elevator.c index 536be74..f6dafa8 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -590,6 +590,12 @@ void elv_insert(request_queue_t *q, struct request *rq, int where) */ rq->cmd_flags |= REQ_SOFTBARRIER; + /* + * Most requeues happen because of a busy condition, + * don't force unplug of the queue for that case. + */ + unplug_it = 0; + if (q->ordseq == 0) { list_add(&rq->queuelist, &q->queue_head); break; @@ -604,11 +610,6 @@ void elv_insert(request_queue_t *q, struct request *rq, int where) } list_add_tail(&rq->queuelist, pos); - /* - * most requeues happen because of a busy condition, don't - * force unplug of the queue for that case. - */ - unplug_it = 0; break; default: - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html