http://bugzilla.kernel.org/show_bug.cgi?id=9684
Summary: ACPI: fix acpi fan state set error
Product: ACPI
Version: 2.5
KernelVersion: 2,6.24-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected], [EMAIL PROTECTED]
Most recent kernel where this bug did not occur: None
Distribution: FC8
Hardware Environment: All
Software Environment: All
Problem Description:Under /proc/acpi, there is a fan control interface, a user
can
set 0 or 3 to /proc/acpi/fan/*/state, 0 denotes D0 state, 3
denotes D3 state, but in current implementation, a user can
set a fan to D1 state by any char excluding '1', '2' and '3'.
For example:
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: off
[EMAIL PROTECTED] acpi]# echo "" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: on
[EMAIL PROTECTED] acpi]# echo "3" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: off
[EMAIL PROTECTED] acpi]# echo "xxxxx" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: on
Obviously, such inputs as "" and "xxxxx" are invalid for fan state.
Steps to reproduce:
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: off
[EMAIL PROTECTED] acpi]# echo "" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: on
[EMAIL PROTECTED] acpi]# echo "3" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: off
[EMAIL PROTECTED] acpi]# echo "xxxxx" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: on
[EMAIL PROTECTED] acpi]# echo "3" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: off
[EMAIL PROTECTED] acpi]# echo "3x" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: off
[EMAIL PROTECTED] acpi]# echo "-1x" > /proc/acpi/fan/C31B/state
[EMAIL PROTECTED] acpi]# cat /proc/acpi/fan/C31B/state
status: on
[EMAIL PROTECTED] acpi]#
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