linux-kernel - Re: [-mm3 PATCH] (Retry) Check the return value of kobject

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Date:	Fri, 6 Apr 2007 10:53:43 +0800
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	viro@...iv.linux.org.uk
Subject: Re: [-mm3 PATCH] (Retry) Check the return value of kobject_add and etc.

On Thu, Apr 05, 2007 at 06:00:16PM +0200, Cornelia Huck wrote:
>On Thu, 5 Apr 2007 23:27:32 +0800,
>WANG Cong <xiyou.wangcong@...il.com> wrote:
>
>> Thank you very much! I know. So I should replace all kfree with kobject_put, like this one:
>> 
>> -	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
>> +	if (sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem")) {
>> +		kobject_uevent(&p->kobj, KOBJ_REMOVE);
>> +		kobject_del(&p->kobj);
>> +		kobject_put(&p->kobj);
>> +		return;
>> +	}
>> 
>> Is that all right?
>> 
>
>Yes, or use kobject_unregister().

OK. Then I send it again. Hopefully it can be accepted this time. ;-p


Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
---

--- linux-2.6.21-rc5-mm4/fs/partitions/check.c.orig	2007-04-05 12:48:29.000000000 +0800
+++ linux-2.6.21-rc5-mm4/fs/partitions/check.c	2007-04-05 23:15:41.000000000 +0800
@@ -385,10 +385,18 @@ void add_partition(struct gendisk *disk,
 	p->kobj.parent = &disk->kobj;
 	p->kobj.ktype = &ktype_part;
 	kobject_init(&p->kobj);
-	kobject_add(&p->kobj);
+	if (kobject_add(&p->kobj)) {
+		kobject_put(&p->kobj);
+		return;
+	}
 	if (!disk->part_uevent_suppress)
 		kobject_uevent(&p->kobj, KOBJ_ADD);
-	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
+	if (sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem")) {
+		kobject_uevent(&p->kobj, KOBJ_REMOVE);
+		kobject_del(&p->kobj);
+		kobject_put(&p->kobj);
+		return;
+	}
 	if (flags & ADDPART_FLAG_WHOLEDISK) {
 		static struct attribute addpartattr = {
 			.name = "whole_disk",
@@ -396,7 +404,13 @@ void add_partition(struct gendisk *disk,
 			.owner = THIS_MODULE,
 		};
 
-		sysfs_create_file(&p->kobj, &addpartattr);
+		if (sysfs_create_file(&p->kobj, &addpartattr)) {
+			sysfs_remove_link(&p->kobj, "subsystem");
+			kobject_uevent(&p->kobj, KOBJ_REMOVE);
+			kobject_del(&p->kobj);
+			kobject_put(&p->kobj);
+			return;
+		}
 	}
 	partition_sysfs_add_subdir(p);
 	disk->part[part-1] = p;


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