From: Greg Kroah-Hartman <gregkh@suse.de>
Date: Sun, 27 Jan 2008 18:29:20 +0000 (-0800)
Subject: x86: fix runtime error in arch/x86/kernel/cpu/mcheck/mce_amd_64.c
X-Git-Tag: v2.6.25-rc1~1137^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=404aae5d420ec543e2e8434f7ec0edf5e2d2b0c4;p=platform%2Fkernel%2Flinux-3.10.git

x86: fix runtime error in arch/x86/kernel/cpu/mcheck/mce_amd_64.c

This problem is due to the kobject rework recently done in this file.

The mce_amd_64.c code uses some wierd forward calls to back out of the
recursive way the code creates kobjects.  Because of this, we need to
verify that we have really created a kobject before calling
kobject_uevent().

Many thanks to Yinghai Lu <yhlu.kernel@gmail.com> for reporting the
problem and testing.

Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Jacob Shin <jacob.shin@amd.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
index 7535887..073afa7 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
@@ -450,7 +450,8 @@ recurse:
 	if (err)
 		goto out_free;
 
-	kobject_uevent(&b->kobj, KOBJ_ADD);
+	if (b)
+		kobject_uevent(&b->kobj, KOBJ_ADD);
 
 	return err;