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    Subject[patch 25/26] ACPI: Clarify resource conflict message
    2.6.31-stable review patch.  If anyone has any objections, please let us know.

    From: Jean Delvare <>

    commit 14f03343ad1080c2fea29ab2c13f05b976c4584e upstream.

    The message "ACPI: Device needs an ACPI driver" is misleading. The
    device _may_ need an ACPI driver, if the BIOS implemented a custom
    API for the device in question (which, AFAIK, can't be checked.) If
    not, then either a generic ACPI driver may be used (for example
    "thermal"), or nothing can be done (other than a white list).

    I propose to reword the message to:

    ACPI: If an ACPI driver is available for this device, you should use
    it instead of the native driver

    which I think is more correct. Comments and suggestions welcome.

    I also added a message warning about possible problems and system
    instability when users pass acpi_enforce_resources=lax, as suggested
    by Len.

    Signed-off-by: Jean Delvare <>
    Cc: Thomas Renninger <>
    Cc: Alan Jenkins <>
    Signed-off-by: Len Brown <>
    Signed-off-by: Greg Kroah-Hartman <>

    drivers/acpi/osl.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    --- a/drivers/acpi/osl.c
    +++ b/drivers/acpi/osl.c
    @@ -1182,7 +1182,13 @@ int acpi_check_resource_conflict(struct
    (long long) res_list_elem->start,
    (long long) res_list_elem->end);
    - printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
    + if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
    + printk(KERN_NOTICE "ACPI: This conflict may"
    + " cause random problems and system"
    + " instability\n");
    + printk(KERN_INFO "ACPI: If an ACPI driver is available"
    + " for this device, you should use it instead of"
    + " the native driver\n");
    if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
    return -EBUSY;

     \ /
      Last update: 2009-10-10 01:45    [W:0.020 / U:383.696 seconds]
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