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x86/mce: Do not register notifiers with invalid prio 

This is just a defensive precaution: do not register notifiers with a
priority which would disrupt the error handling in the notifiers with
prio higher than MCE_PRIO_EDAC.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170327093304.10683-7-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2017-03-27 11:33:04 +02:00 committed by Ingo Molnar
parent 5de97c9f6d
commit 32b40a82e8
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kernel/cpu/mcheck/mce.c
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@ -157,9 +157,10 @@ static atomic_t num_notifiers;
void mce_register_decode_chain(struct notifier_block *nb)
{
atomic_inc(&num_notifiers);
if (WARN_ON(nb->priority > MCE_PRIO_LOWEST && nb->priority < MCE_PRIO_EDAC))
return;
WARN_ON(nb->priority > MCE_PRIO_LOWEST && nb->priority < MCE_PRIO_EDAC);
atomic_inc(&num_notifiers);
atomic_notifier_chain_register(&x86_mce_decoder_chain, nb);
}