linux-kernel - [PATCH 2/4] acpi: exsystem: Inform users about ACPI spec violation

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Message-Id: <20220224113807.91771-2-pmenzel@molgen.mpg.de>
Date:   Thu, 24 Feb 2022 12:38:04 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Robert Moore <robert.moore@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>, linux-acpi@...r.kernel.org,
        devel@...ica.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] acpi: exsystem: Inform users about ACPI spec violation

Inform users if firmware violates the ACPI specification.

Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
 drivers/acpi/acpica/exsystem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
index 6bc5b46e6927..00f66af31ffa 100644
--- a/drivers/acpi/acpica/exsystem.c
+++ b/drivers/acpi/acpica/exsystem.c
@@ -137,6 +137,9 @@ acpi_status acpi_ex_system_do_stall(u32 how_long_us)
 			    "Time parameter is too large (%u)", how_long_us));
 		status = AE_AML_OPERAND_VALUE;
 	} else {
+		if (how_long_us > 100)	/* 100 microseconds */
+			ACPI_WARNING((AE_INFO,
+				      "Time parameter %u us > 100 us violating ACPI spec, please fix the firmware.", how_long_us));
 		acpi_os_stall(how_long_us);
 	}
 
-- 
2.35.1