From 27664c581866c950f31ac007ea2c63fc6e2b29d5 Mon Sep 17 00:00:00 2001 From: "Lee, Chun-Yi" Date: Tue, 20 Mar 2018 13:51:26 +0800 Subject: [PATCH] ACPI / scan: Send change uevent with offine environmental data In current design of ACPI container offline, Kernel emits KOBJ_CHANGE uevent to user space to indidate that the ejection of the container was triggered by platform. (caa73ea15 patch) A pure KOBJ_CHANGE uevent is not enough for user space to identify the purpose. For example, a "udevadm trigger" command can also be used to emit change event to all udev rules. A udev rule can not identify that the event is from kernel for offline or from udevadm for other purpose. Then the offline action in udev rule may also be triggered by udevadm tool. So, similar to the change uevent of dock, kernel sends the KOBJ_CHANGE uevent with a offline environmental data to indicate purpose. It's useful by udev rule for using ENV{EVENT} filter. Acked-by: Michal Hocko Tested-by: Michal Hocko Signed-off-by: "Lee, Chun-Yi" Signed-off-by: Rafael J. Wysocki --- drivers/acpi/scan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 8e63d937babb..490498eca0d3 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -116,6 +116,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) { struct acpi_device_physical_node *pn; bool offline = true; + char *envp[] = { "EVENT=offline", NULL }; /* * acpi_container_offline() calls this for all of the container's @@ -126,7 +127,7 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) list_for_each_entry(pn, &adev->physical_node_list, node) if (device_supports_offline(pn->dev) && !pn->dev->offline) { if (uevent) - kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); + kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp); offline = false; break;