tree 7d5fa8c1c9df7a70e367f78297545c253c890926
parent 683d0e126232d898a481daa3a4ca032c2b1a9660
author Christoph Hellwig <hch@lst.de> 1410903847 -0700
committer Jens Axboe <axboe@fb.com> 1411408519 -0600

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>