From 1f3745afb9d749681f752a726d5296429e65e989 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 10 Aug 2018 15:44:57 +0300 Subject: usb: gadget: uvc: Only halt video streaming endpoint in bulk mode [ Upstream commit 8dbf9c7abefd5c1434a956d5c6b25e11183061a3 ] When USB requests for video data fail to be submitted, the driver signals a problem to the host by halting the video streaming endpoint. This is only valid in bulk mode, as isochronous transfers have no handshake phase and can't thus report a stall. The usb_ep_set_halt() call returns an error when using isochronous endpoints, which we happily ignore, but some UDCs complain in the kernel log. Fix this by only trying to halt the endpoint in bulk mode. Signed-off-by: Laurent Pinchart Reviewed-by: Paul Elder Tested-by: Paul Elder Reviewed-by: Kieran Bingham Signed-off-by: Sasha Levin --- drivers/usb/gadget/function/uvc_video.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/usb/gadget') diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index 540917f54506..d6bab12b0b47 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -136,7 +136,9 @@ static int uvcg_video_ep_queue(struct uvc_video *video, struct usb_request *req) ret = usb_ep_queue(video->ep, req, GFP_ATOMIC); if (ret < 0) { printk(KERN_INFO "Failed to queue request (%d).\n", ret); - usb_ep_set_halt(video->ep); + /* Isochronous endpoints can't be halted. */ + if (usb_endpoint_xfer_bulk(video->ep->desc)) + usb_ep_set_halt(video->ep); } return ret; -- cgit v1.2.3