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blk-throttle: Move the list operation after list validation 

We should move the list operation after validation.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Baolin Wang 2020-10-08 11:52:26 +08:00 committed by Jens Axboe
parent 5b7048b897
commit b7b609de5a
1 changed files with 4 additions and 2 deletions
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6
block/blk-throttle.c
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@ -423,12 +423,13 @@ static void throtl_qnode_add_bio(struct bio *bio, struct throtl_qnode *qn,
*/
static struct bio *throtl_peek_queued(struct list_head *queued)
{
struct throtl_qnode *qn = list_first_entry(queued, struct throtl_qnode, node);
struct throtl_qnode *qn;
struct bio *bio;
if (list_empty(queued))
return NULL;
qn = list_first_entry(queued, struct throtl_qnode, node);
bio = bio_list_peek(&qn->bios);
WARN_ON_ONCE(!bio);
return bio;
@ -451,12 +452,13 @@ static struct bio *throtl_peek_queued(struct list_head *queued)
static struct bio *throtl_pop_queued(struct list_head *queued,
struct throtl_grp **tg_to_put)
{
struct throtl_qnode *qn = list_first_entry(queued, struct throtl_qnode, node);
struct throtl_qnode *qn;
struct bio *bio;
if (list_empty(queued))
return NULL;
qn = list_first_entry(queued, struct throtl_qnode, node);
bio = bio_list_pop(&qn->bios);
WARN_ON_ONCE(!bio);