linux-kernel - [PATCH] xhci: Always restore EP_SOFT_CLEAR

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Date:   Fri, 21 Aug 2020 15:06:52 +0800
From:   Ding Hui <dinghui@...gfor.com.cn>
To:     mathias.nyman@...el.com
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ding Hui <dinghui@...gfor.com.cn>
Subject: [PATCH] xhci: Always restore EP_SOFT_CLEAR_TOGGLE even if ep reset failed

Some devices driver 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

xhch_endpoint_reset failed and left ep_state's EP_SOFT_CLEAR_TOGGLE
bit is still on

So all the subsequent urb sumbit to the ep will fail with the
warn log:

    Can't enqueue URB while manually clearing toggle

We need restore ep_state EP_SOFT_CLEAR_TOGGLE bit after
xhci_endpoint_reset, even if it is failed.

Signed-off-by: Ding Hui <dinghui@...gfor.com.cn>
---
 drivers/usb/host/xhci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 3c41b14ecce7..e9884ae9c77d 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3236,10 +3236,11 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
 
 	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,
-- 
2.17.1