diff mbox

[v5,06/12] blk-mq: Initialize .rq_flags in blk_mq_rq_ctx_init()

Message ID 20170620181549.24903-7-bart.vanassche@wdc.com (mailing list archive)
State New, archived
Headers show

Commit Message

Bart Van Assche June 20, 2017, 6:15 p.m. UTC 
From: Bart Van Assche <bart.vanassche@sandisk.com>

Initialization of blk-mq requests is a bit weird: blk_mq_rq_ctx_init()
is called after a value has been assigned to .rq_flags and .rq_flags
is initialized in __blk_mq_finish_request(). Initialize .rq_flags in
blk_mq_rq_ctx_init() instead of relying on __blk_mq_finish_request().
Moving the initialization of .rq_flags is fine because all changes
and tests of .rq_flags occur between blk_get_request() and finishing
a request.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Ming Lei <ming.lei@redhat.com>
---
 block/blk-mq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Hannes Reinecke June 21, 2017, 6:55 a.m. UTC | #1 
On 06/20/2017 08:15 PM, Bart Van Assche wrote:
> From: Bart Van Assche <bart.vanassche@sandisk.com>
> 
> Initialization of blk-mq requests is a bit weird: blk_mq_rq_ctx_init()
> is called after a value has been assigned to .rq_flags and .rq_flags
> is initialized in __blk_mq_finish_request(). Initialize .rq_flags in
> blk_mq_rq_ctx_init() instead of relying on __blk_mq_finish_request().
> Moving the initialization of .rq_flags is fine because all changes
> and tests of .rq_flags occur between blk_get_request() and finishing
> a request.
> 
> Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Hannes Reinecke <hare@suse.com>
> Cc: Omar Sandoval <osandov@fb.com>
> Cc: Ming Lei <ming.lei@redhat.com>
> ---
>  block/blk-mq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
diff mbox

Patch

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2d21fbccc3a5..6268380c680f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -228,6 +228,8 @@  static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
 	struct blk_mq_tags *tags = blk_mq_tags_from_data(data);
 	struct request *rq = tags->static_rqs[tag];
 
+	rq->rq_flags = 0;
+
 	if (data->flags & BLK_MQ_REQ_INTERNAL) {
 		rq->tag = -1;
 		rq->internal_tag = tag;
@@ -423,7 +425,6 @@  void blk_mq_free_request(struct request *rq)
 		atomic_dec(&hctx->nr_active);
 
 	wbt_done(q->rq_wb, &rq->issue_stat);
-	rq->rq_flags = 0;
 
 	clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags);
 	clear_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags);