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SubjectRe: [PATCH] x86: fix error paths in microcode_init()
On Fri, Dec 02, 2011 at 10:21:01PM +0530, Srivatsa S. Bhat wrote:
> Wow! Good to know that we have an agreement :-)
> Boris, it is again up to you to choose among the two(Signed-off-by or Acked-by)
> for Jan. Hehe ;-)

Well,

since Ingo hasn't pulled yet, I merged the two patches after adding the
required S-O-Bs into the following:

--
From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Date: Mon, 7 Nov 2011 18:05:32 +0530
Subject: [PATCH] x86, microcode: Fix the failure path of microcode update
driver init code

The microcode update driver's initialization code does not handle
failures correctly. This patch fixes this issue.

Signed-off-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20111107123530.12164.31227.stgit@srivatsabhat.in.ibm.com
Link: http://lkml.kernel.org/r/4ED8E2270200007800065120@nat28.tlf.novell.com
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
arch/x86/kernel/microcode_core.c | 28 +++++++++++++++++++---------
1 files changed, 19 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index f2d2a66..9d46f5e 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -256,7 +256,7 @@ static int __init microcode_dev_init(void)
return 0;
}

-static void microcode_dev_exit(void)
+static void __exit microcode_dev_exit(void)
{
misc_deregister(&microcode_dev);
}
@@ -519,10 +519,8 @@ static int __init microcode_init(void)

microcode_pdev = platform_device_register_simple("microcode", -1,
NULL, 0);
- if (IS_ERR(microcode_pdev)) {
- microcode_dev_exit();
+ if (IS_ERR(microcode_pdev))
return PTR_ERR(microcode_pdev);
- }

get_online_cpus();
mutex_lock(&microcode_mutex);
@@ -532,14 +530,12 @@ static int __init microcode_init(void)
mutex_unlock(&microcode_mutex);
put_online_cpus();

- if (error) {
- platform_device_unregister(microcode_pdev);
- return error;
- }
+ if (error)
+ goto out_pdev;

error = microcode_dev_init();
if (error)
- return error;
+ goto out_sysdev_driver;

register_syscore_ops(&mc_syscore_ops);
register_hotcpu_notifier(&mc_cpu_notifier);
@@ -548,6 +544,20 @@ static int __init microcode_init(void)
" <tigran@aivazian.fsnet.co.uk>, Peter Oruba\n");

return 0;
+
+out_sysdev_driver:
+ get_online_cpus();
+ mutex_lock(&microcode_mutex);
+
+ sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
+
+ mutex_unlock(&microcode_mutex);
+ put_online_cpus();
+
+out_pdev:
+ platform_device_unregister(microcode_pdev);
+ return error;
+
}
module_init(microcode_init);

--
1.7.8.rc0


--
Regards/Gruss,
Boris.

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GM: Alberto Bozzo
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