From: Wesley Cheng wcheng@codeaurora.org
stable inclusion from linux-4.19.206 commit c9d60dd3c147c49b3d8eba9aa53ac3b6c24bc161
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commit 4a1e25c0a029b97ea4a3d423a6392bfacc3b2e39 upstream.
During a USB cable disconnect, or soft disconnect scenario, a pending SETUP transaction may not be completed, leading to the following error:
dwc3 a600000.dwc3: timed out waiting for SETUP phase
If this occurs, then the entire pullup disable routine is skipped and proper cleanup and halting of the controller does not complete.
Instead of returning an error (which is ignored from the UDC perspective), allow the pullup disable routine to continue, which will also handle disabling of EP0/1. This will end any active transfers as well. Ensure to clear any delayed_status also, as the timeout could happen within the STATUS stage.
Fixes: bb0147364850 ("usb: dwc3: gadget: don't clear RUN/STOP when it's invalid to do so") Cc: stable@vger.kernel.org Reviewed-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Acked-by: Felipe Balbi balbi@kernel.org Signed-off-by: Wesley Cheng wcheng@codeaurora.org Link: https://lore.kernel.org/r/20210825042855.7977-1-wcheng@codeaurora.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/usb/dwc3/gadget.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index e63bff91aba8c..d61b7aa5d8e5d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1805,10 +1805,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
ret = wait_for_completion_timeout(&dwc->ep0_in_setup, msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT)); - if (ret == 0) { - dev_err(dwc->dev, "timed out waiting for SETUP phase\n"); - return -ETIMEDOUT; - } + if (ret == 0) + dev_warn(dwc->dev, "timed out waiting for SETUP phase\n"); }
spin_lock_irqsave(&dwc->lock, flags); @@ -1946,6 +1944,7 @@ static int __dwc3_gadget_start(struct dwc3 *dwc) /* begin to receive SETUP packets */ dwc->ep0state = EP0_SETUP_PHASE; dwc->link_state = DWC3_LINK_STATE_SS_DIS; + dwc->delayed_status = false; dwc3_ep0_out_start(dwc);
dwc3_gadget_enable_irq(dwc);