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| author | Jens Axboe <axboe@fb.com> | 2016-09-21 10:12:13 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-09-22 14:28:38 -0600 |
| commit | 1b792f2f92784c00db2e6431496e437855d6f12a (patch) | |
| tree | 50c049a9056d96ebaf176d6a339f655282ff9098 /block | |
| parent | 63581af3f31e0dbea112b83f77c4fbb6a10e1406 (diff) | |
| download | lwn-1b792f2f92784c00db2e6431496e437855d6f12a.tar.gz lwn-1b792f2f92784c00db2e6431496e437855d6f12a.zip | |
blk-mq: add flag for drivers wanting blocking ->queue_rq()
If a driver sets BLK_MQ_F_BLOCKING, it is allowed to block in its
->queue_rq() handler. For that case, blk-mq ensures that we always
calls it from a safe context.
Signed-off-by: Jens Axboe <axboe@fb.com>
Tested-by: Josef Bacik <jbacik@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 80d483864247..e9ebe9864cc4 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -908,7 +908,7 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) !blk_mq_hw_queue_mapped(hctx))) return; - if (!async) { + if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { int cpu = get_cpu(); if (cpumask_test_cpu(cpu, hctx->cpumask)) { __blk_mq_run_hw_queue(hctx); |