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blk-mq: fix queue reference leak on blk_mq_alloc_disk_for_queue failure 

Drop the request queue reference just acquired when __alloc_disk_node
failed.

Fixes: 6f8191fdf4 ("block: simplify disk shutdown")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Link: https://lore.kernel.org/r/20221122072753.426077-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-11-22 08:27:53 +01:00 committed by Jens Axboe
parent 5c59789ce7
commit 22c17e279a
1 changed files with 6 additions and 1 deletions
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7
block/blk-mq.c
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@ -4045,9 +4045,14 @@ EXPORT_SYMBOL(__blk_mq_alloc_disk);
struct gendisk *blk_mq_alloc_disk_for_queue(struct request_queue *q,
struct lock_class_key *lkclass)
{
struct gendisk *disk;
if (!blk_get_queue(q))
return NULL;
return __alloc_disk_node(q, NUMA_NO_NODE, lkclass);
disk = __alloc_disk_node(q, NUMA_NO_NODE, lkclass);
if (!disk)
blk_put_queue(q);
return disk;
}
EXPORT_SYMBOL(blk_mq_alloc_disk_for_queue);