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x86, microcode: Unregister syscore_ops after microcode unloaded

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Currently, microcode doesn't unregister syscore_ops after it's
unloaded. So if we modprobe then rmmod microcode, the stale
microcode syscore_ops info will stay on syscore_ops_list.

Later when we're trying to reboot/halt/shutdown the machine, kernel
will panic on syscore_shutdown().

With the patch applied, I can reboot/halt/shutdown my machine successfully.

Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
LKML-Reference: <1301387672-23661-1-git-send-email-dfeng@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Xiaotian Feng 2011-03-29 16:34:32 +08:00 committed by Ingo Molnar
parent ca444564a9
commit 4ac5fc6a3e
1 changed files with 1 additions and 0 deletions
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1
arch/x86/kernel/microcode_core.c
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@ -550,6 +550,7 @@ static void __exit microcode_exit(void)
microcode_dev_exit();
unregister_hotcpu_notifier(&mc_cpu_notifier);
unregister_syscore_ops(&mc_syscore_ops);
get_online_cpus();
mutex_lock(&microcode_mutex);