Patch "usb: gadget: udc: renesas_usb3: Fix return value of usb3_write_pipe()" has been added to the 4.13-stable tree

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 4.13-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-4.13 subdirectory.

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

From: Yoshihiro Shimoda <[email protected]>
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 <[email protected]>

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).

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

@@ -1032,7 +1032,7 @@ 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;

@@ -1053,7 +1053,8 @@ 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 [email protected] are

queue-4.13/usb-gadget-udc-renesas_usb3-fix-return-value-of-usb3_write_pipe.patch queue-4.13/usb-gadget-udc-renesas_usb3-fix-pn_rammap.pn_mpkt-value.patch queue-4.13/usb-renesas_usbhs-fix-usbhsf_fifo_clear-for-rx-direction.patch queue-4.13/usb-gadget-udc-renesas_usb3-fix-for-no-data-control-transfer.patch queue-4.13/usb-renesas_usbhs-fix-the-bclr-setting-condition-for-non-dcp-pipe.patch