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authorChristoph Hellwig <hch@lst.de>2015-09-27 21:01:50 +0200
committerJens Axboe <axboe@fb.com>2015-10-01 10:10:55 +0200
commitf4829a9b7a61e159367350008a608b062c4f6840 (patch)
treea2f488a95324e0c0b558273f48b18413ab2fa221 /drivers/block/null_blk.c
parent60de074ba1e8f327db19bc33d8530131ac01695d (diff)
blk-mq: fix racy updates of rq->errors
blk_mq_complete_request may be a no-op if the request has already been completed by others means (e.g. a timeout or cancellation), but currently drivers have to set rq->errors before calling blk_mq_complete_request, which might leave us with the wrong error value. Add an error parameter to blk_mq_complete_request so that we can defer setting rq->errors until we known we won the race to complete the request. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/null_blk.c')
-rw-r--r--drivers/block/null_blk.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index a295b98c6bae..1c9e4fe5aa44 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -289,7 +289,7 @@ static inline void null_handle_cmd(struct nullb_cmd *cmd)
case NULL_IRQ_SOFTIRQ:
switch (queue_mode) {
case NULL_Q_MQ:
- blk_mq_complete_request(cmd->rq);
+ blk_mq_complete_request(cmd->rq, cmd->rq->errors);
break;
case NULL_Q_RQ:
blk_complete_request(cmd->rq);