linux-kernel - [PATCH] NVMe: Fix error handling of class

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Date:	Sat,  7 Mar 2015 01:43:41 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Matthew Wilcox <willy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] NVMe: Fix error handling of class_create("nvme")

class_create() returns ERR_PTR on failure,
so IS_ERR() should be used instead of check for NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/block/nvme-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index ceb32dd52a6c..30ac50b3009d 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -3165,8 +3165,10 @@ static int __init nvme_init(void)
 		nvme_char_major = result;
 
 	nvme_class = class_create(THIS_MODULE, "nvme");
-	if (!nvme_class)
+	if (IS_ERR(nvme_class)) {
+		result = PTR_ERR(nvme_class);
 		goto unregister_chrdev;
+	}
 
 	result = pci_register_driver(&nvme_driver);
 	if (result)
-- 
1.9.1

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