[PATCH AUTOSEL 4.14 11/43] usb: gadget: net2280: Fix net2280_dequeue()

Sasha Levin
2019-04-22T19:47:51Z

From: Guido Kiener <guido@kiener-muenchen.de>

[ Upstream commit f1d3fba17cd4eeea20397f1324b7b9c69a6a935c ]

When a request must be dequeued with net2280_dequeue() e.g. due
to a device clear action and the same request is finished by the
function scan_dma_completions() then the function net2280_dequeue()
does not find the request in the following search loop and
returns the error -EINVAL without restoring the status ep->stopped.
Thus the endpoint keeps blocked and does not receive any data
anymore.
This fix restores the status and does not issue an error message.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
---
drivers/usb/gadget/udc/net2280.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index a071ab0c163b..170327f84ea1 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -1277,9 +1277,9 @@ static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
break;
}
if (&req->req != _req) {
+ ep->stopped = stopped;
spin_unlock_irqrestore(&ep->dev->lock, flags);
- dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
- __func__);
+ ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
return -EINVAL;
}

--
2.19.1