Patch "usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-gadget-f_uvc-sanity-check-wmaxpacketsize-for-superspeed.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Roger Quadros <[email protected]>
Date: Wed, 8 Mar 2017 16:05:44 +0200
Subject: usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed

From: Roger Quadros <[email protected]>

[ Upstream commit 16bb05d98c904a4f6c5ce7e2d992299f794acbf2 ]

As per USB3.0 Specification "Table 9-20. Standard Endpoint Descriptor", for interrupt and isochronous endpoints, wMaxPacketSize must be set to 1024 if the endpoint defines bMaxBurst to be greater than zero.

---
 drivers/usb/gadget/function/f_uvc.c |    8 ++++++++
 1 file changed, 8 insertions(+)

@@ -594,6 +594,14 @@ uvc_function_bind(struct usb_configurati
 	opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
 	opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
 
+	/* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
+	if (opts->streaming_maxburst &&
+	    (opts->streaming_maxpacket % 1024) != 0) {
+		opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
+		INFO(cdev, "overriding streaming_maxpacket to %d\n",
+		     opts->streaming_maxpacket);
+	}
+
 	/* Fill in the FS/HS/SS Video Streaming specific descriptors from the
 	 * module parameters.
 	 *

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/usb-gadget-f_uvc-sanity-check-wmaxpacketsize-for-superspeed.patch