linux-kernel - [PATCH] loop: Make user notify for adding loop device failed

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Message-Id: <1465265115-12479-1-git-send-email-mnghuan@gmail.com>
Date:	Tue,  7 Jun 2016 10:05:15 +0800
From:	Minfei Huang <mnghuan@...il.com>
To:	axboe@...com, ming.lei@...onical.com, viro@...iv.linux.org.uk,
	jmoyer@...hat.com, sagig@...lanox.com, mszeredi@...e.cz
Cc:	linux-kernel@...r.kernel.org, Minfei Huang <mnghuan@...il.com>
Subject: [PATCH] loop: Make user notify for adding loop device failed

There is no error number returned if loop driver fails in function
alloc_disk to add new loop device. Add a correct error number to make
user notify in this case.

Signed-off-by: Minfei Huang <mnghuan@...il.com>
---
 drivers/block/loop.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 1fa8cc2..2caaf6f 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1765,6 +1765,7 @@ static int loop_add(struct loop_device **l, int i)
 	 */
 	queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue);
 
+	err = -ENOMEM;
 	disk = lo->lo_disk = alloc_disk(1 << part_shift);
 	if (!disk)
 		goto out_free_queue;
-- 
2.7.4 (Apple Git-66)