Fix debugfs_create_file's error checking method for arch/sh/mm/

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@cn.fujitsu.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 8 insertions, 0 deletions

diff --git a/arch/sh/mm/cache-debugfs.c b/arch/sh/mm/cache-debugfs.c
index 0e189ccd4a77..5ba067b26591 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 cef727669c87..84241676265e 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);