From: Ding Hui dinghui@sangfor.com.cn
commit f1ec7ae6c9f8c016db320e204cb519a1da1581b8 upstream.
Some device drivers call libusb_clear_halt when target ep queue is not empty. (eg. spice client connected to qemu for usb redir)
Before commit f5249461b504 ("xhci: Clear the host side toggle manually when endpoint is soft reset"), that works well. But now, we got the error log:
EP not empty, refuse reset
xhci_endpoint_reset failed and left ep_state's EP_SOFT_CLEAR_TOGGLE bit still set
So all the subsequent urb sumbits to the ep will fail with the warn log:
Can't enqueue URB while manually clearing toggle
We need to clear ep_state EP_SOFT_CLEAR_TOGGLE bit after xhci_endpoint_reset, even if it failed.
Fixes: f5249461b504 ("xhci: Clear the host side toggle manually when endpoint is soft reset") Cc: stable stable@vger.kernel.org # v4.17+ Signed-off-by: Ding Hui dinghui@sangfor.com.cn Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20200821091549.20556-4-mathias.nyman@linux.intel.c... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/host/xhci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -3236,10 +3236,11 @@ static void xhci_endpoint_reset(struct u
wait_for_completion(cfg_cmd->completion);
- ep->ep_state &= ~EP_SOFT_CLEAR_TOGGLE; xhci_free_command(xhci, cfg_cmd); cleanup: xhci_free_command(xhci, stop_cmd); + if (ep->ep_state & EP_SOFT_CLEAR_TOGGLE) + ep->ep_state &= ~EP_SOFT_CLEAR_TOGGLE; }
static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,