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author | Hannes Reinecke <hare@suse.de> | 2009-02-18 10:30:15 +0100 |
---|---|---|
committer | Jens Axboe <jens.axboe@oracle.com> | 2009-02-18 10:34:16 +0100 |
commit | be987fdb55a4726e2fcbab7501f89276bdb57288 (patch) | |
tree | bc92a402a4d710718883e67eeab6e0ced221e7ff /block/blk-timeout.c | |
parent | block: fix booting from partitioned md array (diff) | |
download | linux-be987fdb55a4726e2fcbab7501f89276bdb57288.tar.xz linux-be987fdb55a4726e2fcbab7501f89276bdb57288.zip |
block: fix deadlock in blk_abort_queue() for drivers that readd to timeout list
blk_abort_queue() iterates the timeout list and aborts each request on the
list, but if the driver error handling readds a request to the timeout list
during this processing, we could be looping forever. Fix this by splicing
current entries to a local list and run over that list instead.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-timeout.c')
-rw-r--r-- | block/blk-timeout.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/block/blk-timeout.c b/block/blk-timeout.c index a09535377a94..bbbdc4b8ccf2 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -209,12 +209,19 @@ void blk_abort_queue(struct request_queue *q) { unsigned long flags; struct request *rq, *tmp; + LIST_HEAD(list); spin_lock_irqsave(q->queue_lock, flags); elv_abort_queue(q); - list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) + /* + * Splice entries to local list, to avoid deadlocking if entries + * get readded to the timeout list by error handling + */ + list_splice_init(&q->timeout_list, &list); + + list_for_each_entry_safe(rq, tmp, &list, timeout_list) blk_abort_request(rq); spin_unlock_irqrestore(q->queue_lock, flags); |