| Message ID | 20231122091127.3636-1-quic_uaggarwa@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | [RFC] usb: dwc: ep0: Use -ESHUTDOWN in dwc3_ep0_stall_restart | expand |
On Wed, Nov 22, 2023, Uttkarsh Aggarwal wrote: > Current implementation blocks the running operations when Plug-out and > Plug-In is performed continuously, process gets stuck in > dwc3_thread_interrupt(). > > Code Flow: > > CPU1 > > ->Gadget_start > ->dwc3_interrupt > ->dwc3_thread_interrupt > ->dwc3_process_event_buf > ->dwc3_process_event_entry > ->dwc3_endpoint_interrupt > ->dwc3_ep0_interrupt > ->dwc3_ep0_inspect_setup > ->dwc3_ep0_stall_and_restart > > By this time if pending_list is not empty, it will get the next request > on the given list and calls dwc3_gadget_giveback which will unmap request > and call its complete() callback to notify upper layers that it has > completed. Currently dwc3_gadget_giveback status is set to-ECONNRESET, > whereas it should be -ESHUTDOWN. > > Cc: <stable@vger.kernel.org> > Fixes: d742220b3577 ("usb: dwc3: ep0: giveback requests on stall_and_restart") > Signed-off-by: Uttkarsh Aggarwal <quic_uaggarwa@quicinc.com> > --- > drivers/usb/dwc3/ep0.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c > index b94243237293..8317fedda1c0 100644 > --- a/drivers/usb/dwc3/ep0.c > +++ b/drivers/usb/dwc3/ep0.c > @@ -238,7 +238,7 @@ void dwc3_ep0_stall_and_restart(struct dwc3 *dwc) > struct dwc3_request *req; > > req = next_request(&dep->pending_list); > - dwc3_gadget_giveback(dep, req, -ECONNRESET); > + dwc3_gadget_giveback(dep, req, -ESHUTDOWN); There are other conditions which should return -ECONNRESET (e.g. invalid length, direction, got cancelled). For the particular condition that you want for -ESHUTDOWN, I think you can use the dwc->connected field to check for that. BR, Thinh > } > > dwc->eps[0]->trb_enqueue = 0; > -- > 2.17.1 >
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index b94243237293..8317fedda1c0 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -238,7 +238,7 @@ void dwc3_ep0_stall_and_restart(struct dwc3 *dwc) struct dwc3_request *req; req = next_request(&dep->pending_list); - dwc3_gadget_giveback(dep, req, -ECONNRESET); + dwc3_gadget_giveback(dep, req, -ESHUTDOWN); } dwc->eps[0]->trb_enqueue = 0;
Current implementation blocks the running operations when Plug-out and Plug-In is performed continuously, process gets stuck in dwc3_thread_interrupt(). Code Flow: CPU1 ->Gadget_start ->dwc3_interrupt ->dwc3_thread_interrupt ->dwc3_process_event_buf ->dwc3_process_event_entry ->dwc3_endpoint_interrupt ->dwc3_ep0_interrupt ->dwc3_ep0_inspect_setup ->dwc3_ep0_stall_and_restart By this time if pending_list is not empty, it will get the next request on the given list and calls dwc3_gadget_giveback which will unmap request and call its complete() callback to notify upper layers that it has completed. Currently dwc3_gadget_giveback status is set to-ECONNRESET, whereas it should be -ESHUTDOWN. Cc: <stable@vger.kernel.org> Fixes: d742220b3577 ("usb: dwc3: ep0: giveback requests on stall_and_restart") Signed-off-by: Uttkarsh Aggarwal <quic_uaggarwa@quicinc.com> --- drivers/usb/dwc3/ep0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)