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>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
index 753588755fee..073afa7dd89a 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;