[PATCH 4.9 101/153] usb: dwc3: gadget: skip Set/Clear Halt when invalid

Greg Kroah-Hartman
2017-03-10T09:23:14Z

From: Felipe Balbi <felipe.balbi@linux.intel.com>

commit ffb80fc672c3a7b6afd0cefcb1524fb99917b2f3 upstream.

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.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/dwc3/gadget.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1234,6 +1234,9 @@ int __dwc3_gadget_ep_set_halt(struct dwc
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
@@ -1258,6 +1261,8 @@ int __dwc3_gadget_ep_set_halt(struct dwc
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)