Patch "usb: dwc3: fix for the isoc transfer EP_BUSY flag" 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: dwc3: fix for the isoc transfer EP_BUSY flag

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-dwc3-fix-for-the-isoc-transfer-ep_busy-flag.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: Konrad Leszczynski <[email protected]>
Date: Mon, 8 Feb 2016 16:13:12 +0100
Subject: usb: dwc3: fix for the isoc transfer EP_BUSY flag

From: Konrad Leszczynski <[email protected]>

commit 9cad39fe4e4a4fe95d8ea5a7b0692b0a6e89e38b upstream.

commit f3af36511e60 ("usb: dwc3: gadget: always
enable IOC on bulk/interrupt transfers") ended up
regressing Isochronous endpoints by clearing
DWC3_EP_BUSY flag too early, which resulted in
choppy audio playback over USB.

Fix that by partially reverting original commit and making sure that we check for isochronous endpoints.

on bulk/interrupt transfers")

---
 drivers/usb/dwc3/gadget.c |    4 ++++
 1 file changed, 4 insertions(+)

@@ -1965,6 +1965,10 @@ static int dwc3_cleanup_done_reqs(struct
 		return 1;
 	}
 
+	if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
+		if ((event->status & DEPEVT_STATUS_IOC) &&
+				(trb->ctrl & DWC3_TRB_CTRL_IOC))
+			return 0;
 	return 1;
 }
 

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

queue-4.4/usb-dwc3-fix-for-the-isoc-transfer-ep_busy-flag.patch