linux-kernel - RE: [PATCH 4.19 041/247] ACPICA: Fix exception code class checks

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Message-ID: <BYAPR11MB325620EA94EF89F8BBB1C4F687039@BYAPR11MB3256.namprd11.prod.outlook.com>
Date:   Wed, 2 Mar 2022 15:52:29 +0000
From:   "Moore, Robert" <robert.moore@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        "Kaneda, Erik" <erik.kaneda@...el.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: RE: [PATCH 4.19 041/247] ACPICA: Fix exception code class checks

I have the feeling that this was already fixed in a previous commit, but I could be wrong.

-----Original Message-----
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> 
Sent: Monday, March 01, 2021 8:11 AM
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; stable@...r.kernel.org; Maximilian Luz <luzmaximilian@...il.com>; Moore, Robert <robert.moore@...el.com>; Kaneda, Erik <erik.kaneda@...el.com>; Wysocki, Rafael J <rafael.j.wysocki@...el.com>; Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 041/247] ACPICA: Fix exception code class checks

From: Maximilian Luz <luzmaximilian@...il.com>

[ Upstream commit 3dfaea3811f8b6a89a347e8da9ab862cdf3e30fe ]

ACPICA commit 1a3a549286ea9db07d7ec700e7a70dd8bcc4354e

The macros to classify different AML exception codes are broken. For instance,

  ACPI_ENV_EXCEPTION(Status)

will always evaluate to zero due to

  #define AE_CODE_ENVIRONMENTAL      0x0000
  #define ACPI_ENV_EXCEPTION(Status) (Status & AE_CODE_ENVIRONMENTAL)

Similarly, ACPI_AML_EXCEPTION(Status) will evaluate to a non-zero value for error codes of type AE_CODE_PROGRAMMER, AE_CODE_ACPI_TABLES, as well as AE_CODE_AML, and not just AE_CODE_AML as the name suggests.

This commit fixes those checks.

Fixes: d46b6537f0ce ("ACPICA: AML Parser: ignore all exceptions resulting from incorrect AML during table load")
Link: https://github.com/acpica/acpica/commit/1a3a5492
Signed-off-by: Maximilian Luz <luzmaximilian@...il.com>
Signed-off-by: Bob Moore <robert.moore@...el.com>
Signed-off-by: Erik Kaneda <erik.kaneda@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/acpi/acexcep.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/acpi/acexcep.h b/include/acpi/acexcep.h index 856c56ef01431..878b8e26c6c50 100644
--- a/include/acpi/acexcep.h
+++ b/include/acpi/acexcep.h
@@ -59,11 +59,11 @@ struct acpi_exception_info {
 
 #define AE_OK                           (acpi_status) 0x0000
 
-#define ACPI_ENV_EXCEPTION(status)      (status & AE_CODE_ENVIRONMENTAL)
-#define ACPI_AML_EXCEPTION(status)      (status & AE_CODE_AML)
-#define ACPI_PROG_EXCEPTION(status)     (status & AE_CODE_PROGRAMMER)
-#define ACPI_TABLE_EXCEPTION(status)    (status & AE_CODE_ACPI_TABLES)
-#define ACPI_CNTL_EXCEPTION(status)     (status & AE_CODE_CONTROL)
+#define ACPI_ENV_EXCEPTION(status)      (((status) & AE_CODE_MASK) == AE_CODE_ENVIRONMENTAL)
+#define ACPI_AML_EXCEPTION(status)      (((status) & AE_CODE_MASK) == AE_CODE_AML)
+#define ACPI_PROG_EXCEPTION(status)     (((status) & AE_CODE_MASK) == AE_CODE_PROGRAMMER)
+#define ACPI_TABLE_EXCEPTION(status)    (((status) & AE_CODE_MASK) == AE_CODE_ACPI_TABLES)
+#define ACPI_CNTL_EXCEPTION(status)     (((status) & AE_CODE_MASK) == AE_CODE_CONTROL)
 
 /*
  * Environmental exceptions
--
2.27.0