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authorThomas Renninger <trenn@suse.de>2010-07-29 22:30:24 +0200
committerMatthew Garrett <mjg@redhat.com>2010-08-03 09:49:13 -0400
commit500de3dd46ac9f9ae9d124634c68907b7d50d2cb (patch)
tree4ba63c739c3363950a57d459e1fa5c3dcff4a9ab /drivers/acpi/Kconfig
parentde4f10466e9347a2f1bfe39e501539557bed2c4b (diff)
downloadlinux-500de3dd46ac9f9ae9d124634c68907b7d50d2cb.tar.bz2
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/Kconfig11
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.