diff options
| author | Omar Sandoval <osandov@fb.com> | 2017-03-29 01:12:15 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-29 16:09:08 +0200 |
| commit | 334335d2f7a077a5ff561d86b0ad43bedd83ca05 (patch) | |
| tree | 7df8f5fb1b67e34ed19af17476ee2ed01bb2c673 /block/blk-sysfs.c | |
| parent | block: block new I/O just after queue is set as dying (diff) | |
| download | linux-334335d2f7a077a5ff561d86b0ad43bedd83ca05.tar.xz linux-334335d2f7a077a5ff561d86b0ad43bedd83ca05.zip | |
block: warn if sharing request queue across gendisks
Now that the remaining drivers have been converted to one request queue
per gendisk, let's warn if a request queue gets registered more than
once. This will catch future drivers which might do it inadvertently or
any old drivers that I may have missed.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 7f090dd15ca6..833fb7f9ce9d 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -871,6 +871,11 @@ int blk_register_queue(struct gendisk *disk) if (WARN_ON(!q)) return -ENXIO; + WARN_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags), + "%s is registering an already registered queue\n", + kobject_name(&dev->kobj)); + queue_flag_set_unlocked(QUEUE_FLAG_REGISTERED, q); + /* * SCSI probing may synchronously create and destroy a lot of * request_queues for non-existent devices. Shutting down a fully @@ -931,6 +936,8 @@ void blk_unregister_queue(struct gendisk *disk) if (WARN_ON(!q)) return; + queue_flag_clear_unlocked(QUEUE_FLAG_REGISTERED, q); + if (q->mq_ops) blk_mq_unregister_dev(disk_to_dev(disk), q); |