[PATCH] usb: dwc2: Fix NULL qh in dwc2_queue_transaction

[Alexandru M Stan]

When a usb device disconnects in a certain way, dwc2_queue_transaction
still gets called after dwc2_hcd_cleanup_channels.

dwc2_hcd_cleanup_channels does "channel->qh = NULL;" but
dwc2_queue_transaction still wants to dereference qh.
This adds a check for a null qh.

Signed-off-by: Alexandru M Stan <amstan at chromium.org>
---
 drivers/usb/dwc2/hcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index f845c41..d745128 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1004,7 +1004,7 @@ static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg,
 {
 	int retval = 0;
 
-	if (hsotg->core_params->dma_enable > 0) {
+	if (hsotg->core_params->dma_enable > 0 && chan->qh) {
 		if (hsotg->core_params->dma_desc_enable > 0) {
 			if (!chan->xfer_started ||
 			    chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
-- 
2.6.0.rc0.131.gf624c3d