linux-kernel - [PATCH 3.13.y-ckt 019/108] usb: gadget: pxa27x: fix suspend callback

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Message-Id: <1453505401-29377-20-git-send-email-kamal@canonical.com>
Date:	Fri, 22 Jan 2016 15:28:32 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Felipe Balbi <balbi@...com>,
	Luis Henriques <luis.henriques@...onical.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 019/108] usb: gadget: pxa27x: fix suspend callback

3.13.11-ckt33 -stable review patch.  If anyone has any objections, please let me know.

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

From: Felipe Balbi <balbi@...com>

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@...e.fr>
Signed-off-by: Felipe Balbi <balbi@...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@...onical.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.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 3c97da7..22b0e20 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -2555,6 +2555,9 @@ 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;
 }
 
-- 
1.9.1