linux-kernel - [141/289] usbnet: fix usb_autopm_get

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Message-Id: <20101208005735.503461799@clark.site>
Date:	Tue, 07 Dec 2010 16:58:38 -0800
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,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	"David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>,
	Joe Perches <joe@...ches.com>,
	Oliver Neukum <oliver@...kum.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Ming Lei <tom.leiming@...il.com>
Subject: [141/289] usbnet: fix usb_autopm_get_interface failure(v1)

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

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

From: Ming Lei <tom.leiming@...il.com>

commit b0786b430c982dffbb44d8030e6b6088671ce745 upstream.

Since usbnet already took usb runtime pm, we have to
enable runtime pm for usb interface of usbnet, otherwise
usb_autopm_get_interface may return failure and cause
'ifconfig usb0 up' failed if USB_SUSPEND(RUNTIME_PM) is
enabled.

Cc: David Brownell <dbrownell@...rs.sourceforge.net>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Ben Hutchings <ben@...adent.org.uk>
Cc: Joe Perches <joe@...ches.com>
Cc: Oliver Neukum <oliver@...kum.org>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Ming Lei <tom.leiming@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/usb/usbnet.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -45,6 +45,7 @@
 #include <linux/usb/usbnet.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
+#include <linux/pm_runtime.h>
 
 #define DRIVER_VERSION		"22-Aug-2005"
 
@@ -1273,6 +1274,16 @@ usbnet_probe (struct usb_interface *udev
 	struct usb_device		*xdev;
 	int				status;
 	const char			*name;
+	struct usb_driver 	*driver = to_usb_driver(udev->dev.driver);
+
+	/* usbnet already took usb runtime pm, so have to enable the feature
+	 * for usb interface, otherwise usb_autopm_get_interface may return
+	 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
+	 */
+	if (!driver->supports_autosuspend) {
+		driver->supports_autosuspend = 1;
+		pm_runtime_enable(&udev->dev);
+	}
 
 	name = udev->dev.driver->name;
 	info = (struct driver_info *) prod->driver_info;


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