linux-kernel - [PATCH 3.14 104/158] usb: gadget: atmel_usba: fix crashed during stopping when DEBUG is enabled

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Date:	Sun,  4 May 2014 11:40:13 -0400
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Felipe Balbi <balbi@...com>
Subject: [PATCH 3.14 104/158] usb: gadget: atmel_usba: fix crashed during stopping when DEBUG is enabled

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

------------------

From: Gregory CLEMENT <gregory.clement@...e-electrons.com>

commit d8eb6c653ef6b323d630de3c5685478469e248bc upstream.

commit 511f3c5 (usb: gadget: udc-core: fix a regression during gadget driver
unbinding) introduced a crash when DEBUG is enabled.

The debug trace in the atmel_usba_stop function made the assumption that the
driver pointer passed in parameter was not NULL, but since the commit above,
such assumption was no longer always true.

This commit now uses the driver pointer stored in udc which fixes this
issue.

[ balbi@...com : improved commit log a bit ]

Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/atmel_usba_udc.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -1827,12 +1827,12 @@ static int atmel_usba_stop(struct usb_ga
 	toggle_bias(0);
 	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
 
-	udc->driver = NULL;
-
 	clk_disable_unprepare(udc->hclk);
 	clk_disable_unprepare(udc->pclk);
 
-	DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
+	DBG(DBG_GADGET, "unregistered driver `%s'\n", udc->driver->driver.name);
+
+	udc->driver = NULL;
 
 	return 0;
 }


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