From: Jan Engelhardt <jengelh@inai.de>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-acpi@vger.kernel.org
Subject: Re: [PATCH] x86: ignore unspecified bit positions in the ACPI global lock field
Date: Thu, 19 Mar 2020 11:46:13 +0100 (CET) [thread overview]
Message-ID: <nycvar.YFH.7.76.2003191136480.30451@n3.vanv.qr> (raw)
In-Reply-To: <2030043.rEjxodZhqh@kreacher>
On Saturday 2020-03-14 10:46, Rafael J. Wysocki wrote:
>On Thursday, March 5, 2020 1:24:25 PM CET Jan Engelhardt wrote:
>> 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.
>>
>> - return (new < 3) ? -1 : 0;
>> + return ((new & 0x3) < 3) ? -1 : 0;
>
>Applied as 5.7 material, thanks!
Would it make sense to funnel this into the upcoming 5.6?
next prev parent reply other threads:[~2020-03-19 10:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-05 12:24 [PATCH] x86: ignore unspecified bit positions in the ACPI global lock field Jan Engelhardt
2020-03-14 9:46 ` Rafael J. Wysocki
2020-03-19 10:46 ` Jan Engelhardt [this message]
2020-03-19 12:22 ` Rafael J. Wysocki
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