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usb: dwc3: skip interrupt when ep disabled 

In case EP disabled pass only EPCPLT command
to be handled. In other case we could hit
Bug like below.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000003
IP:
[<ffffffff81673428>] dwc3_thread_interrupt+0x11c8/0x1790

while dep->endpoint.desc is NULL.

Signed-off-by: Janusz Dziedzic <januszx.dziedzic@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Janusz Dziedzic 2016-12-08 10:57:34 +01:00 committed by Felipe Balbi
parent 0994b0a257
commit d7fd41c6db
1 changed files with 8 additions and 3 deletions
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11
drivers/usb/dwc3/gadget.c
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@ -2232,9 +2232,14 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
dep = dwc->eps[epnum];
if (!(dep->flags & DWC3_EP_ENABLED) &&
!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
return;
if (!(dep->flags & DWC3_EP_ENABLED)) {
if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
return;
/* Handle only EPCMDCMPLT when EP disabled */
if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT)
return;
}
if (epnum == 0 || epnum == 1) {
dwc3_ep0_interrupt(dwc, event);