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From:   David Arcari <darcari@redhat.com>
To:     Linux ACPI <linux-acpi@vger.kernel.org>
Cc:     Lenny Szubowicz <lszubowi@redhat.com>,
        David Arcari <darcari@redhat.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>, Tony Luck <tony.luck@intel.com>,
        Borislav Petkov <bp@alien8.de>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Alexandru Gagniuc <mr.nuke.me@gmail.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH] ACPI/APEI: Clear GHES block_status before panic()
Date:   Wed, 19 Dec 2018 11:50:52 -0500
Message-Id: <1545238252-79630-1-git-send-email-darcari@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Lenny Szubowicz <lszubowi@redhat.com>

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@redhat.com>
Signed-off-by: David Arcari <darcari@redhat.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Cc: linux-kernel@vger.kernel.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 02c6fd9..f008ba7 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;
-- 
1.8.3.1