Fix debugfs_create_bool's error checking method for wireless/iwlwifi/

debugfs_create_bool() 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: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 753f9387aa68..c3df5aa8df91 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -58,7 +58,8 @@
 #define DEBUGFS_ADD_BOOL(name, parent, ptr) do {                        \
         dbgfs->dbgfs_##parent##_files.file_##name =                     \
         debugfs_create_bool(#name, 0644, dbgfs->dir_##parent, ptr);     \
-        if (IS_ERR(dbgfs->dbgfs_##parent##_files.file_##name))          \
+        if (IS_ERR(dbgfs->dbgfs_##parent##_files.file_##name)           \
+                        || !dbgfs->dbgfs_##parent##_files.file_##name)  \
                 goto err;                                               \
 } while (0)