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blk-mq: avoid infinite recursion with the FUA flag

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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  <[email protected]>
Debugged-by: Ming Lei <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2014-09-16 14:44:07 -07:00 • committed by Jens Axboe
commit a57a178a49
2 changed files with 4 additions and 8 deletions
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1
block/blk-exec.c
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@ -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;