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| author | Christoph Hellwig <hch@lst.de> | 2014-09-16 14:44:07 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-22 11:55:19 -0600 |
| commit | a57a178a490345c7236b0077b3de005754389ed6 (patch) | |
| tree | 7d5fa8c1c9df7a70e367f78297545c253c890926 /block/blk-exec.c | |
| parent | 683d0e126232d898a481daa3a4ca032c2b1a9660 (diff) | |
| download | lwn-a57a178a490345c7236b0077b3de005754389ed6.tar.gz lwn-a57a178a490345c7236b0077b3de005754389ed6.zip | |
blk-mq: avoid infinite recursion with the FUA flag
We should not insert requests into the flush state machine from
blk_mq_insert_request. All incoming flush requests come through
blk_{m,s}q_make_request and are handled there, while blk_execute_rq_nowait
should only be called for BLOCK_PC requests. All other callers
deal with requests that already went through the flush statemchine
and shouldn't be reinserted into it.
Reported-by: Robert Elliott <Elliott@hp.com>
Debugged-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-exec.c')
| -rw-r--r-- | block/blk-exec.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-exec.c b/block/blk-exec.c index f4d27b12c90b..9924725fa50d 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -56,6 +56,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, bool is_pm_resume; WARN_ON(irqs_disabled()); + WARN_ON(rq->cmd_type == REQ_TYPE_FS); rq->rq_disk = bd_disk; rq->end_io = done; |