carl9170: abort tasklet during usb reset

This patch prevents the tasklet code from
interfering while the firmware is down for
an unscheduled maintenance.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/carl9170/usb.c b/drivers/net/wireless/ath/carl9170/usb.c
index fde918d0120b..1e7c2748d85a 100644
--- a/drivers/net/wireless/ath/carl9170/usb.c
+++ b/drivers/net/wireless/ath/carl9170/usb.c
@@ -367,6 +367,9 @@ static void carl9170_usb_tasklet(unsigned long data)
 {
         struct ar9170 *ar = (struct ar9170 *) data;
 
+        if (!IS_INITIALIZED(ar))
+                return;
+
         carl9170_usb_rx_work(ar);
 
         /*