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FROMGIT: usb: dwc: ep0: Update request status in dwc3_ep0_stall_restart

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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: d742220b35 ("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>

Bug: 320413810
(cherry picked from commit e9d40b215e38480fd94c66b06d79045717a59e9c
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/ usb-next)

Change-Id: I7f0afebbcfa88b6b4e622a708b9838dd461661fc
Signed-off-by: Sriram Dash <quic_sriramd@quicinc.com>
This commit is contained in:
Uttkarsh Aggarwal 2023-12-22 15:17:04 +05:30 committed by Todd Kjos
parent 36248a15a7
commit 97100e867e
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/dwc3/ep0.c
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@ -236,7 +236,10 @@ 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;