Patch "usb: gadget: udc: renesas_usb3: Fix return value of usb3_write_pipe()" 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: gadget: udc: renesas_usb3: Fix return value of usb3_write_pipe()

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-gadget-udc-renesas_usb3-fix-return-value-of-usb3_write_pipe.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 447b8a01b84f048d93d43bfe1fcaa4fcc56595cc Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Date: Mon, 25 Sep 2017 17:01:25 +0900
Subject: usb: gadget: udc: renesas_usb3: Fix return value of usb3_write_pipe()

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

commit 447b8a01b84f048d93d43bfe1fcaa4fcc56595cc upstream.

This patch fixes an issue that this driver cannot go status stage
in control read when the req.zero is set to 1 and the len in
usb3_write_pipe() is set to 0. Otherwise, if we use g_ncm driver,
usb enumeration takes long time (5 seconds or more).

Fixes: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/udc/renesas_usb3.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -879,7 +879,7 @@ static int usb3_write_pipe(struct renesa
 			usb3_ep->ep.maxpacket);
 	u8 *buf = usb3_req->req.buf + usb3_req->req.actual;
 	u32 tmp = 0;
-	bool is_last;
+	bool is_last = !len ? true : false;
 
 	if (usb3_wait_pipe_status(usb3_ep, PX_STA_BUFSTS) < 0)
 		return -EBUSY;
@@ -900,7 +900,8 @@ static int usb3_write_pipe(struct renesa
 		usb3_write(usb3, tmp, fifo_reg);
 	}
 
-	is_last = usb3_is_transfer_complete(usb3_ep, usb3_req);
+	if (!is_last)
+		is_last = usb3_is_transfer_complete(usb3_ep, usb3_req);
 	/* Send the data */
 	usb3_set_px_con_send(usb3_ep, len, is_last);
 


Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@renesas.com are

queue-4.9/usb-gadget-udc-renesas_usb3-fix-return-value-of-usb3_write_pipe.patch
queue-4.9/usb-gadget-udc-renesas_usb3-fix-pn_rammap.pn_mpkt-value.patch
queue-4.9/usb-renesas_usbhs-fix-usbhsf_fifo_clear-for-rx-direction.patch
queue-4.9/usb-gadget-udc-renesas_usb3-fix-for-no-data-control-transfer.patch
queue-4.9/usb-renesas_usbhs-fix-the-bclr-setting-condition-for-non-dcp-pipe.patch