lkml.org 
[lkml]   [2009]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] ACPI: add "auto" to acpi_enforce_resources
    On Mon, 30 Mar 2009 00:01:27 +0200, Luca Tettamanti wrote:
    > here's a revised patch:
    > ---
    >
    > The following patch changes the default value for option "acpi_enforce_resource"
    > to strict. It enforces strict resource checking - disallowing access by native
    > drivers to IO ports and memory regions claimed by ACPI firmware.
    >
    > The patch is mainly aimed to block native hwmon drivers from touching
    > monitoring chips that ACPI thinks it own.
    >
    > Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>

    Acked-by: Jean Delvare <jdelvare@suse.de>

    > ---
    > Documentation/kernel-parameters.txt | 16 ++++++++++++++++
    > drivers/acpi/osl.c | 6 +++---
    > 2 files changed, 19 insertions(+), 3 deletions(-)
    >
    > Index: b/Documentation/kernel-parameters.txt
    > ===================================================================
    > --- a/Documentation/kernel-parameters.txt 2009-03-29 23:58:11.574893074 +0200
    > +++ b/Documentation/kernel-parameters.txt 2009-03-29 23:58:31.582894852 +0200
    > @@ -259,6 +259,22 @@
    > to assume that this machine's pmtimer latches its value
    > and always returns good values.
    >
    > + acpi_enforce_resources= [ACPI]
    > + { strict | lax | no }
    > + Check for resource conflicts between native drivers
    > + and ACPI OperationRegions (SystemIO and SystemMemory
    > + only). IO ports and memory declared in ACPI might be
    > + used by the ACPI subsystem in arbitrary AML code and
    > + can interfere with legacy drivers.
    > + strict (default): access to resources claimed by ACPI
    > + is denied; legacy drivers trying to access reserved
    > + resources will fail to bind to device using them.
    > + lax: access to resources claimed by ACPI is allowed;
    > + legacy drivers trying to access reserved resources
    > + will bind successfully but a warning message is logged.
    > + no: ACPI OperationRegions are not marked as reserved,
    > + no further checks are performed.
    > +
    > agp= [AGP]
    > { off | try_unsupported }
    > off: disable AGP support
    > Index: b/drivers/acpi/osl.c
    > ===================================================================
    > --- a/drivers/acpi/osl.c 2009-03-29 23:58:11.942913535 +0200
    > +++ b/drivers/acpi/osl.c 2009-03-29 23:58:31.586892815 +0200
    > @@ -1070,9 +1070,9 @@
    > * in arbitrary AML code and can interfere with legacy drivers.
    > * acpi_enforce_resources= can be set to:
    > *
    > - * - strict (2)
    > + * - strict (default) (2)
    > * -> further driver trying to access the resources will not load
    > - * - lax (default) (1)
    > + * - lax (1)
    > * -> further driver trying to access the resources will load, but you
    > * get a system message that something might go wrong...
    > *
    > @@ -1084,7 +1084,7 @@
    > #define ENFORCE_RESOURCES_LAX 1
    > #define ENFORCE_RESOURCES_NO 0
    >
    > -static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
    > +static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
    >
    > static int __init acpi_enforce_resources_setup(char *str)
    > {
    >
    >
    > Luca


    --
    Jean Delvare


    \
     
     \ /
      Last update: 2009-03-30 09:39    [W:3.978 / U:0.252 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site