| | From | Paul Gortmaker <> | | Subject | [34-longterm 072/247] dm mpath: disable blk_abort_queue | | Date | Thu, 23 Jun 2011 13:32:20 -0400 |
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From: Mike Snitzer <snitzer@redhat.com>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. If you see a problem with using this for longterm, please comment. ------------------- commit 09c9d4c9b6a2b5909ae3c6265e4cd3820b636863 upstream.
Revert commit 224cb3e981f1b2f9f93dbd49eaef505d17d894c2 dm: Call blk_abort_queue on failed paths
Multipath began to use blk_abort_queue() to allow for lower latency path deactivation. This was found to cause list corruption:
the cmd gets blk_abort_queued/timedout run on it and the scsi eh somehow is able to complete and run scsi_queue_insert while scsi_request_fn is still trying to process the request.
https://www.redhat.com/archives/dm-devel/2010-November/msg00085.html
Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: Mike Anderson <andmike@linux.vnet.ibm.com> Cc: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> --- drivers/md/dm-mpath.c | 12 ------------ 1 files changed, 0 insertions(+), 12 deletions(-) diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index da2223a..ed1d0c2 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -33,7 +33,6 @@ struct pgpath { unsigned fail_count; /* Cumulative failure count */ struct dm_path path; - struct work_struct deactivate_path; struct work_struct activate_path; }; @@ -116,7 +115,6 @@ static struct workqueue_struct *kmultipathd, *kmpath_handlerd; static void process_queued_ios(struct work_struct *work); static void trigger_event(struct work_struct *work); static void activate_path(struct work_struct *work); -static void deactivate_path(struct work_struct *work); /*----------------------------------------------- @@ -129,7 +127,6 @@ static struct pgpath *alloc_pgpath(void) if (pgpath) { pgpath->is_active = 1; - INIT_WORK(&pgpath->deactivate_path, deactivate_path); INIT_WORK(&pgpath->activate_path, activate_path); } @@ -141,14 +138,6 @@ static void free_pgpath(struct pgpath *pgpath) kfree(pgpath); } -static void deactivate_path(struct work_struct *work) -{ - struct pgpath *pgpath = - container_of(work, struct pgpath, deactivate_path); - - blk_abort_queue(pgpath->path.dev->bdev->bd_disk->queue); -} - static struct priority_group *alloc_priority_group(void) { struct priority_group *pg; @@ -994,7 +983,6 @@ static int fail_path(struct pgpath *pgpath) pgpath->path.dev->name, m->nr_valid_paths); schedule_work(&m->trigger_event); - queue_work(kmultipathd, &pgpath->deactivate_path); out: spin_unlock_irqrestore(&m->lock, flags); -- 1.7.4.4
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