linux-kernel - [PATCH] acpi: apei: clear error status before acknowledging the error

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Date:   Fri, 28 Jul 2017 16:25:03 -0600
From:   Tyler Baicar <tbaicar@...eaurora.org>
To:     rjw@...ysocki.net, lenb@...nel.org, will.deacon@....com,
        james.morse@....com, bp@...e.de, shiju.jose@...wei.com,
        geliangtang@...il.com, andriy.shevchenko@...ux.intel.com,
        tony.luck@...el.com, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Tyler Baicar <tbaicar@...eaurora.org>
Subject: [PATCH] acpi: apei: clear error status before acknowledging the error

Currently we acknowledge errors before clearing the error status.
This could cause a new error to be populated by firmware in-between
the error acknowledgment and the error status clearing which would
cause the second error's status to be cleared without being handled.
So, clear the error status before acknowledging the errors.

Also, make sure to acknowledge the error if the error status read
fails.

Signed-off-by: Tyler Baicar <tbaicar@...eaurora.org>
---
 drivers/acpi/apei/ghes.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index d661d45..6a6895a 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -743,17 +743,15 @@ static int ghes_proc(struct ghes *ghes)
 	}
 	ghes_do_proc(ghes, ghes->estatus);
 
+out:
+	ghes_clear_estatus(ghes);
 	/*
 	 * GHESv2 type HEST entries introduce support for error acknowledgment,
 	 * so only acknowledge the error if this support is present.
 	 */
 	if (is_hest_type_generic_v2(ghes)) {
 		rc = ghes_ack_error(ghes->generic_v2);
-		if (rc)
-			return rc;
 	}
-out:
-	ghes_clear_estatus(ghes);
 	return rc;
 }
 
-- 
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Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.