From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751456AbdH1Qxr (ORCPT ); Mon, 28 Aug 2017 12:53:47 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:44092 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751306AbdH1Qxp (ORCPT ); Mon, 28 Aug 2017 12:53:45 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org D602860723 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=tbaicar@codeaurora.org From: Tyler Baicar To: rjw@rjwysocki.net, lenb@kernel.org, will.deacon@arm.com, james.morse@arm.com, bp@suse.de, shiju.jose@huawei.com, geliangtang@gmail.com, andriy.shevchenko@linux.intel.com, tony.luck@intel.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Tyler Baicar Subject: [PATCH V3] acpi: apei: clear error status before acknowledging the error Date: Mon, 28 Aug 2017 10:53:41 -0600 Message-Id: <1503939221-27732-1-git-send-email-tbaicar@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. V3: Seperate check for -ENOENT return value V2: Only send error ack if there was an error populated Remove curly braces that are no longer needed Signed-off-by: Tyler Baicar --- drivers/acpi/apei/ghes.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index d661d45..8d43b1c 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -743,17 +743,19 @@ static int ghes_proc(struct ghes *ghes) } ghes_do_proc(ghes, ghes->estatus); +out: + ghes_clear_estatus(ghes); + + if (rc == -ENOENT) + return rc; + /* * 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); + if (is_hest_type_generic_v2(ghes)) + return ghes_ack_error(ghes->generic_v2); + return rc; } -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.