usb: dwc3: gadget: skip Set/Clear Halt when invalid

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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index d2b860ebfe13..5dc6bfc91f4b 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1234,6 +1234,9 @@ 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
@@ -1258,6 +1261,8 @@ 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)