[3.16.y-ckt stable] Patch "usb: gadget: pxa27x: fix suspend callback" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    usb: gadget: pxa27x: fix suspend callback

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt23.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

---8<------------------------------------------------------------

>From d712aa56effe8c17621e7624e1ad2e9d932aa6bd Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi at ti.com>
Date: Wed, 18 Nov 2015 17:06:00 -0600
Subject: usb: gadget: pxa27x: fix suspend callback

commit 391e6dcb37857d5659b53def2f41e2f56850d33c upstream.

pxa27x disconnects pullups on suspend but doesn't
notify the gadget driver about it, so gadget driver
can't disable the endpoints it was using.

This causes problems on resume because gadget core
will think endpoints are still enabled and just
ignore the following usb_ep_enable().

Fix this problem by calling
gadget_driver->disconnect().

Tested-by: Robert Jarzmik <robert.jarzmik at free.fr>
Signed-off-by: Felipe Balbi <balbi at ti.com>
[ luis: backported to 3.16:
  - file rename: drivers/usb/gadget/udc/pxa27x_udc.c ->
    drivers/usb/gadget/pxa27x_udc.c ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/gadget/pxa27x_udc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index cdf4d678be96..a63dee15bdc7 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -2558,6 +2558,9 @@ static int pxa_udc_suspend(struct platform_device *_dev, pm_message_t state)
 	udc->pullup_resume = udc->pullup_on;
 	dplus_pullup(udc, 0);

+	if (udc->driver)
+		udc->driver->disconnect(&udc->gadget);
+
 	return 0;
 }