This is a note to let you know that I've just added the patch titled usb: dwc3: gadget: Prevent losing events in event cache to the 4.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-dwc3-gadget-prevent-losing-events-in-event-cache.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d325a1de49d61ee11aca58a529571c91ecea7879 Mon Sep 17 00:00:00 2001 From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Date: Thu, 11 May 2017 17:26:47 -0700 Subject: usb: dwc3: gadget: Prevent losing events in event cache From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> commit d325a1de49d61ee11aca58a529571c91ecea7879 upstream. 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. Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx> Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/dwc3/gadget.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -3078,6 +3078,15 @@ static irqreturn_t dwc3_check_event_buf( 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) Patches currently in stable-queue which might be from Thinh.Nguyen@xxxxxxxxxxxx are queue-4.11/usb-dwc3-gadget-prevent-losing-events-in-event-cache.patch