linux-kernel - [PATCH 4.20 238/352] ACPI/APEI: Clear GHES block

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Message-Id: <20190211141902.318740796@linuxfoundation.org>
Date:   Mon, 11 Feb 2019 15:17:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lenny Szubowicz <lszubowi@...hat.com>,
        David Arcari <darcari@...hat.com>,
        Tyler Baicar <baicar.tyler@...il.com>,
        Borislav Petkov <bp@...e.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.20 238/352] ACPI/APEI: Clear GHES block_status before panic()

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 98cff8b23ed1c763a029ee81ea300df0d153d07d ]

In __ghes_panic() clear the block status in the APEI generic
error status block for that generic hardware error source before
calling panic() to prevent a second panic() in the crash kernel
for exactly the same fatal error.

Otherwise ghes_probe(), running in the crash kernel, would see
an unhandled error in the APEI generic error status block and
panic again, thereby precluding any crash dump.

Signed-off-by: Lenny Szubowicz <lszubowi@...hat.com>
Signed-off-by: David Arcari <darcari@...hat.com>
Tested-by: Tyler Baicar <baicar.tyler@...il.com>
Acked-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/acpi/apei/ghes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 02c6fd9caff7..f008ba7c9ced 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -691,6 +691,8 @@ static void __ghes_panic(struct ghes *ghes)
 {
 	__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
 
+	ghes_clear_estatus(ghes);
+
 	/* reboot to log the error! */
 	if (!panic_timeout)
 		panic_timeout = ghes_panic_timeout;
-- 
2.19.1