From: Wesley Cheng wcheng@codeaurora.org
[ Upstream commit 8212937305f84ef73ea81036dafb80c557583d4b ]
Current sequence utilizes dwc3_gadget_disable_irq() alongside synchronize_irq() to ensure that no further DWC3 events are generated. However, the dwc3_gadget_disable_irq() API only disables device specific events. Endpoint events can still be generated. Briefly disable the interrupt line, so that the cleanup code can run to prevent device and endpoint events. (i.e. __dwc3_gadget_stop() and dwc3_stop_active_transfers() respectively)
Without doing so, it can lead to both the interrupt handler and the pullup disable routine both writing to the GEVNTCOUNT register, which will cause an incorrect count being read from future interrupts.
Fixes: ae7e86108b12 ("usb: dwc3: Stop active transfers before halting the controller") Signed-off-by: Wesley Cheng wcheng@codeaurora.org Link: https://lore.kernel.org/r/1621571037-1424-1-git-send-email-wcheng@codeaurora... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/gadget.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 5f2e4a2638f5..78a4b9e438b7 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2030,13 +2030,10 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) }
/* - * Synchronize any pending event handling before executing the controller - * halt routine. + * Synchronize and disable any further event handling while controller + * is being enabled/disabled. */ - if (!is_on) { - dwc3_gadget_disable_irq(dwc); - synchronize_irq(dwc->irq_gadget); - } + disable_irq(dwc->irq_gadget);
spin_lock_irqsave(&dwc->lock, flags);
@@ -2074,6 +2071,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
ret = dwc3_gadget_run_stop(dwc, is_on, false); spin_unlock_irqrestore(&dwc->lock, flags); + enable_irq(dwc->irq_gadget); + pm_runtime_put(dwc->dev);
return ret;