From a37959282e44dbf13e1181eaf5058a1e898e15bd Mon Sep 17 00:00:00 2001 From: Piotr Ciura Date: Thu, 15 May 2025 09:38:21 +0200 Subject: [PATCH] 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 (cherry picked from commit 29a191ad3810152bf8a15309899a27aaf5c41c26) --- drivers/usb/device/usb_dc_stm32.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/device/usb_dc_stm32.c b/drivers/usb/device/usb_dc_stm32.c index dbfd359f10bbc..38aec65a046f0 100644 --- a/drivers/usb/device/usb_dc_stm32.c +++ b/drivers/usb/device/usb_dc_stm32.c @@ -733,6 +733,10 @@ 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,