Sometimes very rarely, The count is 0 and the DWC3 flag is set has status.
It must not have these status. Because, It can make happen interrupt storming
status.
So, It have to clean up DWC3_EVENT_PENDING flags set when count is 0.
It means "There are no interrupts to handle.".
(struct dwc3_event_buffer *) ev_buf = 0xFFFFFF883DBF1180 (
(void *) buf = 0xFFFFFFC00DBDD000 = end+0x337D000,
(void *) cache = 0xFFFFFF8839F54080,
(unsigned int) length = 0x1000,
(unsigned int) lpos = 0x0,
(unsigned int) count = 0x0,
(unsigned int) flags = 0x00000001,
(dma_addr_t) dma = 0x00000008BD7D7000,
(struct dwc3 *) dwc = 0xFFFFFF8839CBC880,
(u64) android_kabi_reserved1 = 0x0),
(time = 47557628930999, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628931268, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628932383, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628932652, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628933768, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628934037, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628935152, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628935460, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628936575, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628936845, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628937960, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628938229, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628939345, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628939652, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628940768, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628941037, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628942152, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628942422, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628943537, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628943806, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628944922, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628945229, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628946345, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628946614, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
(time = 47557628947729, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
(time = 47557628947999, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
Signed-off-by: JaeHun Jung <jh0801.jung@xxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 789976567f9f..5d2d5a9b9915 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4355,8 +4355,11 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
* irq event handler completes before caching new event to prevent
* losing events.
*/
- if (evt->flags & DWC3_EVENT_PENDING)
+ if (evt->flags & DWC3_EVENT_PENDING) {
+ if (!evt->count)
+ evt->flags &= ~DWC3_EVENT_PENDING;
return IRQ_HANDLED;
+ }
count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
count &= DWC3_GEVNTCOUNT_MASK;
--
2.31.1
