linux-kernel - [PATCH] driver: dont update dev

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Message-ID: <49EA3176.4010901@kernel.org>
Date:	Sat, 18 Apr 2009 13:00:54 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org
Subject: [PATCH] driver: dont update dev_name if it is not changed


notice one system /proc/iomem some entries missed the name for pci_devices

it turns that dev->dev.kobj name is changed after device_add.

[Impact: fix corrupted names in /proc/iomem ]

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 lib/kobject.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

Index: linux-2.6/lib/kobject.c
===================================================================
--- linux-2.6.orig/lib/kobject.c
+++ linux-2.6/lib/kobject.c
@@ -216,12 +216,21 @@ int kobject_set_name_vargs(struct kobjec
 				  va_list vargs)
 {
 	const char *old_name = kobj->name;
+	char *new_name;
 	char *s;
 
-	kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
-	if (!kobj->name)
+	new_name = kvasprintf(GFP_KERNEL, fmt, vargs);
+	if (!new_name)
 		return -ENOMEM;
 
+	/* different ? */
+	if (!strcmp(new_name, old_name)) {
+		kfree(new_name);
+		return 0;
+	}
+
+	kobj->name = new_name;
+
 	/* ewww... some of these buggers have '/' in the name ... */
 	while ((s = strchr(kobj->name, '/')))
 		s[0] = '!';
--
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