linux-kernel - [PATCH] usb: gadget: uvc: fix dropped frame after missed isoc

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Message-Id: <20221017205446.523796-2-w36195@motorola.com>
Date:   Mon, 17 Oct 2022 15:54:39 -0500
From:   Dan Vacura <w36195@...orola.com>
To:     linux-usb@...r.kernel.org
Cc:     Daniel Scally <dan.scally@...asonboard.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Jeff Vanhoof <qjv001@...orola.com>,
        Dan Vacura <w36195@...orola.com>, stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Felipe Balbi <balbi@...nel.org>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Paul Elder <paul.elder@...asonboard.com>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH] usb: gadget: uvc: fix dropped frame after missed isoc

With the re-use of the previous completion status in 0d1c407b1a749
("usb: dwc3: gadget: Return proper request status") it could be possible
that the next frame would also get dropped if the current frame has a
missed isoc error. Ensure that an interrupt is requested for the start
of a new frame.

Fixes: fc78941d8169 ("usb: gadget: uvc: decrease the interrupt load to a quarter")
Cc: <stable@...r.kernel.org>
Signed-off-by: Dan Vacura <w36195@...orola.com>
---
V1 -> V3:
- no change, new patch in series

 drivers/usb/gadget/function/uvc_video.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index bb037fcc90e6..323977716f5a 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -431,7 +431,8 @@ static void uvcg_video_pump(struct work_struct *work)
 
 		/* Endpoint now owns the request */
 		req = NULL;
-		video->req_int_count++;
+		if (buf->state != UVC_BUF_STATE_DONE)
+			video->req_int_count++;
 	}
 
 	if (!req)
-- 
2.34.1