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author | Jianchao Wang <jianchao.w.wang@oracle.com> | 2019-01-30 17:01:56 +0800 |
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committer | Jens Axboe <axboe@kernel.dk> | 2019-01-30 08:53:54 -0700 |
commit | 85bd6e61f34dffa8ec2dc75ff3c02ee7b2f1cbce (patch) | |
tree | 62e799a9a8bf88ef4831a9ffc865fd33f3e3f36c /arch/csky | |
parent | 2e3c18d0ada16f145087b2687afcad1748c0827c (diff) | |
download | linux-85bd6e61f34dffa8ec2dc75ff3c02ee7b2f1cbce.tar.gz |
blk-mq: fix a hung issue when fsync
Florian reported a io hung issue when fsync(). It should be triggered by following race condition. data + post flush a flush blk_flush_complete_seq case REQ_FSEQ_DATA blk_flush_queue_rq issued to driver blk_mq_dispatch_rq_list try to issue a flush req failed due to NON-NCQ command .queue_rq return BLK_STS_DEV_RESOURCE request completion req->end_io // doesn't check RESTART mq_flush_data_end_io case REQ_FSEQ_POSTFLUSH blk_kick_flush do nothing because previous flush has not been completed blk_mq_run_hw_queue insert rq to hctx->dispatch due to RESTART is still set, do nothing To fix this, replace the blk_mq_run_hw_queue in mq_flush_data_end_io with blk_mq_sched_restart to check and clear the RESTART flag. Fixes: bd166ef1 (blk-mq-sched: add framework for MQ capable IO schedulers) Reported-by: Florian Stecker <m19@florianstecker.de> Tested-by: Florian Stecker <m19@florianstecker.de> Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'arch/csky')
0 files changed, 0 insertions, 0 deletions