At least macOS seems to be sending
ClearFeature(ENDPOINT_HALT) to endpoints which
aren't Halted. This makes DWC3's CLEARSTALL command
time out which causes several issues for the driver.
Instead, let's just return 0 and bail out early.
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
this falls into "has never worked before" category, so I'll be sending
it together with other patches for v4.11 merge window. Still, it's a
valid bug that's likely needed for stable trees.
drivers/usb/dwc3/gadget.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 6faf484e5dfc..0a664d8eba3f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1379,6 +1379,9 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
unsigned transfer_in_flight;
unsigned started;
+ if (dep->flags & DWC3_EP_STALL)
+ return 0;
+
if (dep->number > 1)
trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
else
@@ -1400,6 +1403,8 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
else
dep->flags |= DWC3_EP_STALL;
} else {
+ if (!(dep->flags & DWC3_EP_STALL))
+ return 0;
ret = dwc3_send_clear_stall_ep_cmd(dep);
if (ret)
--
2.11.0.295.gd7dffce1ce
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