From 77a086890173c0958515f7322880e4680cf12f8e Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Mon, 12 Jan 2015 15:04:06 -0500 Subject: [PATCH] block: keep established cmd_flags when cloning into a blk-mq request blk_mq_alloc_request() may establish REQ_MQ_INFLIGHT in addition to incrementing the hctx->nr_active count. Any cmd_flags that are established in the newly allocated clone request must be preserved in addition to the cmd_flags that are later copied over from the original request as part of blk_rq_prep_clone(). Otherwise, if REQ_MQ_INFLIGHT isn't set in the clone request the hctx->nr_active count won't get decremented via blk_mq_free_request(). The only consumer of blk_rq_prep_clone() is request-based DM, which uses blk_rq_init() prior to calling blk_rq_prep_clone() for the non-blk-mq case. Given the cloned request's cmd_flags will be 0 it is safe to OR them with the original request's cmd_flags for both the non-blk-mq and blk-mq cases. Reported-by: Bart Van Assche Signed-off-by: Keith Busch Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe --- Reading git-format-patch failed