From 772918524dfb8c8869120728c1b1109a2d49493c Mon Sep 17 00:00:00 2001
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Sun, 30 Oct 2016 05:28:27 +0100
Subject: [PATCH] nbd: Fix error handling
'blk_mq_alloc_request()' returns an error pointer in case of error, not
NULL. So test it with IS_ERR.
Fixes: fd8383fd88a2 ("nbd: convert to blkmq")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Jens Axboe <axboe@fb.com>
---
drivers/block/nbd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 19a16b2dbb91..7a1048755914 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -599,7 +599,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
return -EINVAL;
sreq = blk_mq_alloc_request(bdev_get_queue(bdev), WRITE, 0);
- if (!sreq)
+ if (IS_ERR(sreq))
return -ENOMEM;
mutex_unlock(&nbd->tx_lock);