wl1271: Check vif for NULL when indicating beacon-loss

Because the interface is started and the vif are created and destroyed
separately, there is a slim possibility beacon-loss indications occur while
there is no vif - causing a kernel-oops unless checked.

Add checking for the vif.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl12xx/wl1271_event.c b/drivers/net/wireless/wl12xx/wl1271_event.c
index 6ff535d..0a145af 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1271_event.c
+++ b/drivers/net/wireless/wl12xx/wl1271_event.c
@@ -150,7 +150,7 @@ static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
                        return ret;
        }
 
-       if (beacon_loss) {
+       if (wl->vif && beacon_loss) {
                /* Obviously, it's dangerous to release the mutex while
                   we are holding many of the variables in the wl struct.
                   That's why it's done last in the function, and care must