linux-kernel - [PATCH] kobject: avoid unnecessary assignment of kobj->parent

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Message-Id: <1433384030-16039-1-git-send-email-weiyang@linux.vnet.ibm.com>
Date:	Thu,  4 Jun 2015 10:13:50 +0800
From:	Wei Yang <weiyang@...ux.vnet.ibm.com>
To:	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, Wei Yang <weiyang@...ux.vnet.ibm.com>
Subject: [PATCH] kobject: avoid unnecessary assignment of kobj->parent

kobj->parent is changed only when it is NULL originally.

This patch moves the assignment in the "if" to avoid unnecessary assignment.

Signed-off-by: Wei Yang <weiyang@...ux.vnet.ibm.com>
---
 lib/kobject.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/kobject.c b/lib/kobject.c
index 03d4ab3..37b10bb 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -216,9 +216,8 @@ static int kobject_add_internal(struct kobject *kobj)
 	/* join kset if set, use it as parent if we do not already have one */
 	if (kobj->kset) {
 		if (!parent)
-			parent = kobject_get(&kobj->kset->kobj);
+			parent = kobj->parent = kobject_get(&kobj->kset->kobj);
 		kobj_kset_join(kobj);
-		kobj->parent = parent;
 	}
 
 	pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
-- 
1.7.9.5

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