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 29a191ad3810152bf8a15309899a27aaf5c41c26)
diff --git a/drivers/usb/device/usb_dc_stm32.c b/drivers/usb/device/usb_dc_stm32.c
index b5fc75c..ede883f 100644
--- a/drivers/usb/device/usb_dc_stm32.c
+++ b/drivers/usb/device/usb_dc_stm32.c
@@ -772,6 +772,10 @@
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,
