diff options
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index ce603dcbd493..a7e28095026d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2856,6 +2856,15 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt) return IRQ_HANDLED; } + /* + * With PCIe legacy interrupt, test shows that top-half irq handler can + * be called again after HW interrupt deassertion. Check if bottom-half + * irq event handler completes before caching new event to prevent + * losing events. + */ + if (evt->flags & DWC3_EVENT_PENDING) + return IRQ_HANDLED; + count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0)); count &= DWC3_GEVNTCOUNT_MASK; if (!count) |