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nbd: blk_mq_init_queue returns an error code on failure, not NULL 

Additionally, don't assign directly to disk->queue, otherwise
blk_put_queue (called via put_disk) will choke (panic) on the errno
stored there.

Bug found by code inspection after Omar found a similar issue in
virtio_blk.  Compile-tested only.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jeff Moyer 2017-01-09 15:20:31 -05:00 committed by Jens Axboe
parent a14d749fce
commit 25b4acfc7d
1 changed files with 4 additions and 2 deletions
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6
drivers/block/nbd.c
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@ -1042,6 +1042,7 @@ static int __init nbd_init(void)
return -ENOMEM;
for (i = 0; i < nbds_max; i++) {
struct request_queue *q;
struct gendisk *disk = alloc_disk(1 << part_shift);
if (!disk)
goto out;
@ -1067,12 +1068,13 @@ static int __init nbd_init(void)
* every gendisk to have its very own request_queue struct.
* These structs are big so we dynamically allocate them.
*/
disk->queue = blk_mq_init_queue(&nbd_dev[i].tag_set);
if (!disk->queue) {
q = blk_mq_init_queue(&nbd_dev[i].tag_set);
if (IS_ERR(q)) {
blk_mq_free_tag_set(&nbd_dev[i].tag_set);
put_disk(disk);
goto out;
}
disk->queue = q;
/*
* Tell the block layer that we are not a rotational device