Patch "usb: r8a66597-hcd: select a different endpoint on timeout" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    usb: r8a66597-hcd: select a different endpoint on timeout

to the 4.9-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-r8a66597-hcd-select-a-different-endpoint-on-timeout.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 1f873d857b6c2fefb4dada952674aa01bcfb92bd Mon Sep 17 00:00:00 2001
From: Chris Brandt <chris.brandt@renesas.com>
Date: Thu, 27 Apr 2017 12:12:02 -0700
Subject: usb: r8a66597-hcd: select a different endpoint on timeout

From: Chris Brandt <chris.brandt@renesas.com>

commit 1f873d857b6c2fefb4dada952674aa01bcfb92bd upstream.

If multiple endpoints on a single device have pending IN URBs and one
endpoint times out due to NAKs (perfectly legal), select a different
endpoint URB to try.
The existing code only checked to see another device address has pending
URBs and ignores other IN endpoints on the current device address. This
leads to endpoints never getting serviced if one endpoint is using NAK as
a flow control method.

Fixes: 5d3043586db4 ("usb: r8a66597-hcd: host controller driver for R8A6659")
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/host/r8a66597-hcd.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -1785,6 +1785,7 @@ static void r8a66597_td_timer(unsigned l
 		pipe = td->pipe;
 		pipe_stop(r8a66597, pipe);
 
+		/* Select a different address or endpoint */
 		new_td = td;
 		do {
 			list_move_tail(&new_td->queue,
@@ -1794,7 +1795,8 @@ static void r8a66597_td_timer(unsigned l
 				new_td = td;
 				break;
 			}
-		} while (td != new_td && td->address == new_td->address);
+		} while (td != new_td && td->address == new_td->address &&
+			td->pipe->info.epnum == new_td->pipe->info.epnum);
 
 		start_transfer(r8a66597, new_td);
 


Patches currently in stable-queue which might be from chris.brandt@renesas.com are

queue-4.9/usb-r8a66597-hcd-decrease-timeout.patch
queue-4.9/usb-r8a66597-hcd-select-a-different-endpoint-on-timeout.patch