linux-kernel - [PATCH] Fix debugfs_create_file's error checking method for arch/sh/mm/

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Date:	Fri, 17 Oct 2008 19:25:09 +0800
From:	Zhaolei <zhaolei@...fujitsu.com>
To:	lethal@...ux-sh.org
CC:	linux-sh@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] Fix debugfs_create_file's error checking method for arch/sh/mm/

Hi,

debugfs_create_file() returns NULL if an error occurs, returns -ENODEV
when debugfs is not enabled in the kernel.

Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
---
 arch/sh/mm/cache-debugfs.c |    6 ++++++
 arch/sh/mm/pmb.c           |    2 ++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/sh/mm/cache-debugfs.c b/arch/sh/mm/cache-debugfs.c
index 0e189cc..5ba067b 100644
--- a/arch/sh/mm/cache-debugfs.c
+++ b/arch/sh/mm/cache-debugfs.c
@@ -130,12 +130,18 @@ static int __init cache_debugfs_init(void)
 	dcache_dentry = debugfs_create_file("dcache", S_IRUSR, sh_debugfs_root,
 					    (unsigned int *)CACHE_TYPE_DCACHE,
 					    &cache_debugfs_fops);
+	if (!dcache_dentry)
+		return -ENOMEM;
 	if (IS_ERR(dcache_dentry))
 		return PTR_ERR(dcache_dentry);
 
 	icache_dentry = debugfs_create_file("icache", S_IRUSR, sh_debugfs_root,
 					    (unsigned int *)CACHE_TYPE_ICACHE,
 					    &cache_debugfs_fops);
+	if (!icache_dentry) {
+		debugfs_remove(dcache_dentry);
+		return -ENOMEM;
+	}
 	if (IS_ERR(icache_dentry)) {
 		debugfs_remove(dcache_dentry);
 		return PTR_ERR(icache_dentry);
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index cef7276..8424167 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -394,6 +394,8 @@ static int __init pmb_debugfs_init(void)
 
 	dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
 				     sh_debugfs_root, NULL, &pmb_debugfs_fops);
+	if (!dentry)
+		return -ENOMEM;
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
-- 
1.5.5.3


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