| Message ID | 20200504231215.55956-1-john.stultz@linaro.org (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 00e21763f2c8cab21b7befa52996d1b18bde5c42 |
| Headers | show |
| Series | [RESEND] dwc3: Remove check for HWO flag in dwc3_gadget_ep_reclaim_trb_sg() | expand |
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 00746c2848c0..585cb3deea7a 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2483,9 +2483,6 @@ static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep, for_each_sg(sg, s, pending, i) { trb = &dep->trb_pool[dep->trb_dequeue]; - if (trb->ctrl & DWC3_TRB_CTRL_HWO) - break; - req->sg = sg_next(s); req->num_pending_sgs--;
The check for the HWO flag in dwc3_gadget_ep_reclaim_trb_sg() causes us to break out of the loop before we call dwc3_gadget_ep_reclaim_completed_trb(), which is what likely should be clearing the HWO flag. This can cause odd behavior where we never reclaim all the trbs in the sg list, so we never call giveback on a usb req, and that will causes transfer stalls. This effectively resovles the adb stalls seen on HiKey960 after userland changes started only using AIO in adbd. Cc: YongQin Liu <yongqin.liu@linaro.org> Cc: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com> Cc: Yang Fei <fei.yang@intel.com> Cc: Thinh Nguyen <thinhn@synopsys.com> Cc: Tejas Joglekar <tejas.joglekar@synopsys.com> Cc: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Cc: Jack Pham <jackp@codeaurora.org> Cc: Josh Gao <jmgao@google.com> Cc: Todd Kjos <tkjos@google.com> Cc: Felipe Balbi <balbi@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-usb@vger.kernel.org Cc: stable@vger.kernel.org #4.20+ Signed-off-by: John Stultz <john.stultz@linaro.org> --- drivers/usb/dwc3/gadget.c | 3 --- 1 file changed, 3 deletions(-)