diff options
| author | Thomas Renninger <trenn@suse.de> | 2010-07-30 00:30:24 +0400 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2010-08-03 17:49:13 +0400 |
| commit | 500de3dd46ac9f9ae9d124634c68907b7d50d2cb (patch) | |
| tree | 4ba63c739c3363950a57d459e1fa5c3dcff4a9ab /drivers/acpi/Kconfig | |
| parent | de4f10466e9347a2f1bfe39e501539557bed2c4b (diff) | |
| download | linux-500de3dd46ac9f9ae9d124634c68907b7d50d2cb.tar.xz | |
acpi ec_sys: Be more cautious about ec write access
- Set Kconfig option default n
- Only allow root to read/write io file (sever bug!)
- Introduce write support module param -> default off
- Properly clean up if any debugfs files cannot be created
Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: mjg59@srcf.ucam.org
CC: platform-driver-x86@vger.kernel.org
CC: linux-acpi@vger.kernel.org
CC: astarikovskiy@suse.de
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/acpi/Kconfig')
| -rw-r--r-- | drivers/acpi/Kconfig | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index f7226d1bc80e..08e0140920e1 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -106,14 +106,19 @@ config ACPI_SYSFS_POWER config ACPI_EC_DEBUGFS tristate "EC read/write access through /sys/kernel/debug/ec" - default y + default n help Say N to disable Embedded Controller /sys/kernel/debug interface + Be aware that using this interface can confuse your Embedded + Controller in a way that a normal reboot is not enough. You then + have to power of your system, and remove the laptop battery for + some seconds. An Embedded Controller typically is available on laptops and reads sensor values like battery state and temperature. - The kernel access the EC through ACPI parsed code provided by BIOS - tables. + The kernel accesses the EC through ACPI parsed code provided by BIOS + tables. This option allows to access the EC directly without ACPI + code being involved. Thus this option is a debug option that helps to write ACPI drivers and can be used to identify ACPI code or EC firmware bugs. |