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FROMLIST: usb: dwc2: Fix NULL qh in dwc2_queue_transaction

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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.

(am from https://patchwork.kernel.org/patch/7245251/)
Change-Id: Ia9c7f5febe0bb6f0123cfc85c90beb9fc1d80bdd
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
This commit is contained in:
Meng Dongyang
2018-04-13 17:56:00 +08:00
committed by Tao Huang
parent d26d7a61c4
commit 5ab47a4a46
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/dwc2/hcd.c
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@@ -2857,7 +2857,7 @@ static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg,
list_move_tail(&chan->split_order_list_entry,
&hsotg->split_order);
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) {