linux-kernel - [PATCH] x86/mce: Schedule work after restart from sysfs update

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Date:   Wed, 1 Mar 2023 20:26:23 +0000
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     <linux-edac@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <tony.luck@...el.com>,
        <x86@...nel.org>, Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH] x86/mce: Schedule work after restart from sysfs update

A recent change introduced a flag to queue up errors found during
boot-time polling. These errors will be processed during late init once
the MCE subsystem is fully set up.

A number of sysfs updates call mce_cpu_restart() which goes through a
subset of the CPU init flow. This includes polling MCA banks and logging
any errors found. Since the same function is used as boot-time polling,
errors will be queued. However, the system is now past late init, so the
errors will remain queued until another error is found and the workqueue
is triggered.

Call mce_schedule_work() at the end of mce_cpu_restart() so that queued
errors are processed.

Fixes: 3bff147b187d ("x86/mce: Defer processing of early errors")
Cc: stable@...r.kernel.org
Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 7832a69d170e..2eec60f50057 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -2355,6 +2355,7 @@ static void mce_restart(void)
 {
 	mce_timer_delete_all();
 	on_each_cpu(mce_cpu_restart, NULL, 1);
+	mce_schedule_work();
 }

 /* Toggle features for corrected errors */
-- 
2.34.1