diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-05-03 00:26:16 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-05-12 14:14:24 +0200 |
| commit | 683058e315f00a216fd6c79df4f63bc9945ca434 (patch) | |
| tree | e4b143220938ebb24a7bf72f286f275090b2afef /Documentation | |
| parent | 0902a9044fa5b7a0456ea4daacec2c2b3189ba8c (diff) | |
ACPI / hotplug: Use device offline/online for graceful hot-removal
Modify the generic ACPI hotplug code to be able to check if devices
scheduled for hot-removal may be gracefully removed from the system
using the device offline/online mechanism introduced previously.
Namely, make acpi_scan_hot_remove() handling device hot-removal call
device_offline() for all physical companions of the ACPI device nodes
involved in the operation and check the results. If any of the
device_offline() calls fails, the function will not progress to the
removal phase (which cannot be aborted), unless its (new) force
argument is set (in case of a failing offline it will put the devices
offlined by it back online).
In support of 'forced' device hot-removal, add a new sysfs attribute
'force_remove' that will reside under /sys/firmware/acpi/hotplug/.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-firmware-acpi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi index ce9bee98b43..b4436cca97a 100644 --- a/Documentation/ABI/testing/sysfs-firmware-acpi +++ b/Documentation/ABI/testing/sysfs-firmware-acpi @@ -44,6 +44,16 @@ Description: or 0 (unset). Attempts to write any other values to it will cause -EINVAL to be returned. +What: /sys/firmware/acpi/hotplug/force_remove +Date: May 2013 +Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> +Description: + The number in this file (0 or 1) determines whether (1) or not + (0) the ACPI subsystem will allow devices to be hot-removed even + if they cannot be put offline gracefully (from the kernel's + viewpoint). That number can be changed by writing a boolean + value to this file. + What: /sys/firmware/acpi/interrupts/ Date: February 2008 Contact: Len Brown <lenb@kernel.org> |