linux-kernel - [PATCH] fs: proc: check status of register

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Message-Id: <20181226030642.72757-1-kjlu@umn.edu>
Date:   Tue, 25 Dec 2018 21:06:40 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Davidlohr Bueso <dbueso@...e.de>,
        David Howells <dhowells@...hat.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH] fs: proc: check status of register_filesystem

register_filesystem() could fail. The fix issues an error message if it
fails.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 fs/proc/root.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/proc/root.c b/fs/proc/root.c
index f4b1a9d2eca6..7dcd947cba23 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -141,7 +141,8 @@ void __init proc_root_init(void)
 	proc_mkdir("bus", NULL);
 	proc_sys_init();
 
-	register_filesystem(&proc_fs_type);
+	if (register_filesystem(&proc_fs_type))
+		pr_err("failed to register the filesystem.\n");
 }
 
 static int proc_root_getattr(const struct path *path, struct kstat *stat,
-- 
2.17.2 (Apple Git-113)