This is a note to let you know that I've just added the patch titled
usb: dwc: ep0: Update request status in dwc3_ep0_stall_restart
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-testing branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will be merged to the usb-next branch sometime soon, after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
From e9d40b215e38480fd94c66b06d79045717a59e9c Mon Sep 17 00:00:00 2001 From: Uttkarsh Aggarwal quic_uaggarwa@quicinc.com Date: Fri, 22 Dec 2023 15:17:04 +0530 Subject: usb: dwc: ep0: Update request status in dwc3_ep0_stall_restart
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 based on condition if not dwc->connected is true.
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 Link: https://lore.kernel.org/r/20231222094704.20276-1-quic_uaggarwa@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/ep0.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index b94243237293..6ae8a36f21cf 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -238,7 +238,10 @@ 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); + if (!dwc->connected) + dwc3_gadget_giveback(dep, req, -ESHUTDOWN); + else + dwc3_gadget_giveback(dep, req, -ECONNRESET); }
dwc->eps[0]->trb_enqueue = 0;