AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

blk-mq: Put driver tag in blk_mq_dispatch_rq_list() when no budget

Browse Source 
If in blk_mq_dispatch_rq_list() we find no budget, then we break of the
dispatch loop, but the request may keep the driver tag, evaulated
in 'nxt' in the previous loop iteration.

Fix by putting the driver tag for that request.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2020-04-16 19:18:51 +08:00 committed by Jens Axboe
parent 8f3d9f3542
commit 5fe56de799
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
block/blk-mq.c
View File

@ -1222,8 +1222,10 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list,
rq = list_first_entry(list, struct request, queuelist); rq = list_first_entry(list, struct request, queuelist);
hctx = rq->mq_hctx; hctx = rq->mq_hctx;
if (!got_budget && !blk_mq_get_dispatch_budget(hctx)) if (!got_budget && !blk_mq_get_dispatch_budget(hctx)) {
blk_mq_put_driver_tag(rq);
break; break;
}
if (!blk_mq_get_driver_tag(rq)) { if (!blk_mq_get_driver_tag(rq)) {
/* /*