ath9k: Check for root debugfs file

Creation of the root debugfs file could have failed
for some reason, check properly before proceeding in this
case.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/debug.c b/drivers/net/wireless/ath9k/debug.c
index fdf9528fa49b..97df20cbf528 100644
--- a/drivers/net/wireless/ath9k/debug.c
+++ b/drivers/net/wireless/ath9k/debug.c
@@ -498,6 +498,9 @@ int ath9k_init_debug(struct ath_softc *sc)
 {
         sc->debug.debug_mask = ath9k_debug;
 
+        if (!ath9k_debugfs_root)
+                return -ENOENT;
+
         sc->debug.debugfs_phy = debugfs_create_dir(wiphy_name(sc->hw->wiphy),
                                                       ath9k_debugfs_root);
         if (!sc->debug.debugfs_phy)