linux-kernel - [05/26] usb: musb: fix oops on musb_gadget

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Date:	Mon, 15 Aug 2011 19:42:48 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	John Stultz <john.stultz@...aro.org>,
	Felipe Balbi <balbi@...com>
Subject: [05/26] usb: musb: fix oops on musb_gadget_pullup

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: John Stultz <john.stultz@...aro.org>

commit 72c487dfb94d02025fb7437dfe2314d836d5a9ab upstream.

an 'unhandled fault' is causes when a gadget driver calls
usb_gadget_connect() while the USB cable isn't plugged into
the OTG port.

the fault is caused by an access to MUSB's memory space
while its clock is turned off due to pm_runtime kicking
in.

in order to fix the fault, we enclose musb_gadget_pullup()
with pm_runtime_get_sync() ... pm_runtime_put() calls to
be sure we will always reach that path with clock turned on.

[ balbi@...com : simplified commit log; removed few things
	which didn't belong there ]

Reported-by: Zach Pfeffer <zach.pfeffer@...aro.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/musb/musb_gadget.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1698,6 +1698,8 @@ static int musb_gadget_pullup(struct usb
 
 	is_on = !!is_on;
 
+	pm_runtime_get_sync(musb->controller);
+
 	/* NOTE: this assumes we are sensing vbus; we'd rather
 	 * not pullup unless the B-session is active.
 	 */
@@ -1707,6 +1709,9 @@ static int musb_gadget_pullup(struct usb
 		musb_pullup(musb, is_on);
 	}
 	spin_unlock_irqrestore(&musb->lock, flags);
+
+	pm_runtime_put(musb->controller);
+
 	return 0;
 }
 


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