Commit 84e8c9fb authored May 15, 2025 by Piotr Ciura Committed by Fabio Baltieri Jul 25, 2025

drivers: usb: Prevent from perpetual locked state



The USB CDC driver is unable to process any bulk IN transfers
after receiving spurious 'Clear Feature - Endpoint Halt' request
from host due to perpetual locked state caused by previously
scheduled transfer, that will never be finished, as the endpoint's state
is set to NAK. Fix by ignoring spurious request.

Signed-off-by: Piotr Ciura <piotr.ciura@hidglobal.com>
(cherry picked from commit 29a191ad)

parent f82ade9f

drivers/usb/device/usb_dc_stm32.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -865,6 +865,10 @@ int usb_dc_ep_clear_stall(const uint8_t ep)
		return -EINVAL;
		}

		if (!ep_state->ep_stalled) {
		return 0;
		}

		status = HAL_PCD_EP_ClrStall(&usb_dc_stm32_state.pcd, ep);
		if (status != HAL_OK) {
		LOG_ERR("HAL_PCD_EP_ClrStall failed(0x%02x), %d", ep,

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