ath6kl: Fix system crash sometimes for USB hotplug

System crash because of NULL pointer reference due to
cleanup_scatter is not implemented for USB.

Signed-off-by: Ray Chen <raychen@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/usb.c b/drivers/net/wireless/ath/ath6kl/usb.c
index 73aacdd047c..dfbbe9e7ff7 100644
--- a/drivers/net/wireless/ath/ath6kl/usb.c
+++ b/drivers/net/wireless/ath/ath6kl/usb.c
@@ -1037,6 +1037,14 @@ static void ath6kl_usb_stop(struct ath6kl *ar)
         hif_stop(ar);
 }
 
+static void ath6kl_usb_cleanup_scatter(struct ath6kl *ar)
+{
+        /*
+         * USB doesn't support it. Just return.
+         */
+        return;
+}
+
 static const struct ath6kl_hif_ops ath6kl_usb_ops = {
         .diag_read32 = ath6kl_usb_diag_read32,
         .diag_write32 = ath6kl_usb_diag_write32,
@@ -1049,6 +1057,7 @@ static const struct ath6kl_hif_ops ath6kl_usb_ops = {
         .pipe_get_default = ath6kl_usb_get_default_pipe,
         .pipe_map_service = ath6kl_usb_map_service_pipe,
         .pipe_get_free_queue_number = ath6kl_usb_get_free_queue_number,
+        .cleanup_scatter = ath6kl_usb_cleanup_scatter,
 };
 
 /* ath6kl usb driver registered functions */