wl12xx: fix illegal memset if debugfs is not enabled

If we try to reset the debugfs statistics when debugfs is not configured in
the kernel, we're memset an illegal pointer, because it has never been
allocated.  So check whether we have debugfs enabled by looking into the
wl->rootdir before trying to reset the fw_stats struct.

Reported-by: Joerie de Gram <j.de.gram@gmail.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/debugfs.c b/drivers/net/wireless/wl12xx/debugfs.c
index 2ac289e51484..8106a6c8a1ba 100644
--- a/drivers/net/wireless/wl12xx/debugfs.c
+++ b/drivers/net/wireless/wl12xx/debugfs.c
@@ -414,6 +414,9 @@ err:
 
 void wl1271_debugfs_reset(struct wl1271 *wl)
 {
+        if (!wl->rootdir)
+                return;
+
         memset(wl->stats.fw_stats, 0, sizeof(*wl->stats.fw_stats));
         wl->stats.retry_count = 0;
         wl->stats.excessive_retries = 0;