linux-kernel - [PATCH] [163/223] USB: fix autosuspend bug in usb-serial

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Message-Id: <20101212234747.4052EB27BF@basil.firstfloor.org>
Date:	Mon, 13 Dec 2010 00:47:47 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	stern@...land.harvard.edu, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [163/223] USB: fix autosuspend bug in usb-serial

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Alan Stern <stern@...land.harvard.edu>

commit abf03184a31a3286fc0ab30f838ddee8ba9f9b7b upstream.

This patch (as1437) fixes a bug in the usb-serial autosuspend
handling.  Since the usb-serial core now has autosuspend support, it
must set the .supports_autosuspend member in every serial driver it
registers.  Otherwise the usb_autopm_get_interface() call won't work.

This fixes Bugzilla #23012.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Reported-by: Kevin Smith <thirdwiggin@...il.com>
Reported-and-tested-by: Simon Gerber <gesimu@...il.com>
Reported-and-tested-by: Matteo Croce <matteo@...nwrt.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/usb/serial/usb-serial.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux/drivers/usb/serial/usb-serial.c
===================================================================
--- linux.orig/drivers/usb/serial/usb-serial.c
+++ linux/drivers/usb/serial/usb-serial.c
@@ -52,6 +52,7 @@ static struct usb_driver usb_serial_driv
 	.suspend =	usb_serial_suspend,
 	.resume =	usb_serial_resume,
 	.no_dynamic_id = 	1,
+	.supports_autosuspend =	1,
 };
 
 /* There is no MODULE_DEVICE_TABLE for usbserial.c.  Instead
@@ -1344,6 +1345,8 @@ int usb_serial_register(struct usb_seria
 		return -ENODEV;
 
 	fixup_generic(driver);
+	if (driver->usb_driver)
+		driver->usb_driver->supports_autosuspend = 1;
 
 	if (!driver->description)
 		driver->description = driver->driver.name;
--
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