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Message-Id: <20200416131251.119400098@linuxfoundation.org>
Date: Thu, 16 Apr 2020 15:23:21 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Jan Engelhardt <jengelh@...i.de>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.19 060/146] acpi/x86: ignore unspecified bit positions in the ACPI global lock field
From: Jan Engelhardt <jengelh@...i.de>
commit ecb9c790999fd6c5af0f44783bd0217f0b89ec2b upstream.
The value in "new" is constructed from "old" such that all bits defined
as reserved by the ACPI spec[1] are left untouched. But if those bits
do not happen to be all zero, "new < 3" will not evaluate to true.
The firmware of the laptop(s) Medion MD63490 / Akoya P15648 comes with
garbage inside the "FACS" ACPI table. The starting value is
old=0x4944454d, therefore new=0x4944454e, which is >= 3. Mask off
the reserved bits.
[1] https://uefi.org/sites/default/files/resources/ACPI_6_2.pdf
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206553
Cc: All applicable <stable@...r.kernel.org>
Signed-off-by: Jan Engelhardt <jengelh@...i.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/kernel/acpi/boot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1752,7 +1752,7 @@ int __acpi_acquire_global_lock(unsigned
new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
val = cmpxchg(lock, old, new);
} while (unlikely (val != old));
- return (new < 3) ? -1 : 0;
+ return ((new & 0x3) < 3) ? -1 : 0;
}
int __acpi_release_global_lock(unsigned int *lock)
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