linux-kernel - [PATCH for 2.6.23] Driver core: fix regression with SYSFS

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Message-Id: <200710071222.22218.dmitry.torokhov@gmail.com>
Date:	Sun, 7 Oct 2007 12:22:21 -0400
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Anssi Hannula <anssi.hannula@...il.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, Greg KH <greg@...ah.com>,
	Kay Sievers <kay.sievers@...y.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH for 2.6.23] Driver core: fix regression with SYSFS_DEPRECTATED

Subject: Driver core: fix SYSF_DEPRECATED breakage for nested classdevs
From: Dmitry Torokhov <dmitry.torokhov@...il.com>

We should only reparent to a class former class devices that
form the base of class hierarchy. Nested devices should still
grow from their real parents.

Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
Tested-by: Andrey Borzenkov <arvidjaar@...l.ru>
Tested-by: Anssi Hannula <anssi.hannula@...il.com>
---

Linus,

Please consider applying this patch before releasing 2.6.23. It fixes
a regression in UDEV/HAL caused by conversion of input devices from
class devices to regular devices.

Thanks,

Dmitry

Index: linux/drivers/base/core.c
===================================================================
--- linux.orig/drivers/base/core.c
+++ linux/drivers/base/core.c
@@ -586,9 +586,13 @@ void device_initialize(struct device *de
 static struct kobject * get_device_parent(struct device *dev,
 					  struct device *parent)
 {
-	/* Set the parent to the class, not the parent device */
-	/* this keeps sysfs from having a symlink to make old udevs happy */
-	if (dev->class)
+	/*
+	 * Set the parent to the class, not the parent device
+	 * for topmost devices in class hierarchy.
+	 * This keeps sysfs from having a symlink to make old
+	 * udevs happy
+	 */
+	if (dev->class && (!parent || parent->class != dev->class))
 		return &dev->class->subsys.kobj;
 	else if (parent)
 		return &parent->kobj;

\\
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