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authorThinh Nguyen <Thinh.Nguyen@synopsys.com>2017-05-11 17:26:47 -0700
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-05-16 14:11:03 +0300
commitd325a1de49d61ee11aca58a529571c91ecea7879 (patch)
tree70c95be4a03930383c886ff500a7fd032fffc20a /drivers/usb
parentf1d6826cae30e97e37a1f2481d7e1dc4faa09ce1 (diff)
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usb: dwc3: gadget: Prevent losing events in event cache
The dwc3 driver can overwite its previous events if its top-half IRQ handler (TH) gets invoked again before processing the events in the cache. We see this as a hang in the file transfer and the host will attempt to reset the device. TH gets the event count and deasserts the interrupt line by writing DWC3_GEVNTSIZ_INTMASK to DWC3_GEVNTSIZ. If there's a new event coming between reading the event count and interrupt deassertion, dwc3 will lose previous pending events. More generally, we will see 0 event count, which should not affect anything. This shouldn't be possible in the current dwc3 implementation. However, through testing and reading the PCIe trace, the TH occasionally still gets invoked one more time after HW interrupt deassertion. (With PCIe legacy interrupts, TH is called repeatedly as long as the interrupt line is asserted). We suspect that there is a small detection delay in the SW. To avoid this issue, Check DWC3_EVENT_PENDING flag to determine if the events are processed in the bottom-half IRQ handler. If not, return IRQ_HANDLED and don't process new event. Cc: stable@vger.kernel.org Signed-off-by: Thinh Nguyen <thinhn@synopsys.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/dwc3/gadget.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 3d6180805eb8..aea9a5b948b4 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3036,6 +3036,15 @@ 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)