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| author | Lee, Chun-Yi <joeyli.kernel@gmail.com> | 2017-07-03 15:26:10 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-04 21:45:41 +0200 |
| commit | d429e5c12269a930b81d8b57b788bbe3cf12e815 (patch) | |
| tree | 607835ff007b4eb5154b610aaaf8e981e064beed /drivers/acpi | |
| parent | Linux 4.12 (diff) | |
| download | linux-d429e5c12269a930b81d8b57b788bbe3cf12e815.tar.xz linux-d429e5c12269a930b81d8b57b788bbe3cf12e815.zip | |
ACPI / scan: Indicate to platform when hot remove returns busy
In hotplug logic, it always indicates non-specific failure to
platform through _OST when handing ACPI hot-remove event failed. Then
platform terminates the hot-remove process but it can not identify
the reason.
Base on current hot-remove code, there have two situations that it
returns busy:
- OSPM try to offline an individual device, but the device offline
function returns "busy".
- When the ejection event is applied to an "not offlined yet"
container. OSPM sends a kobject change event to userspace and
returns "busy".
Both of them will returns -EBUSY to ACPI device hotplug function.
Then, the hotplug function indicates non-specific failure to platform
just like for any other error, e.g. -ENODEV or -EIO.
The benefit to the platform for identifying the OS "busy" state is
that it can use a different approach to handle the "busy" instead of
simply terminating the hot-remove operation for an unknown reason.
For example, the platform can wait for a while and then re-trigger
hot-remove.
Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
[ rjw: Changelog massage ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/scan.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index d53162997f32..ce8817503262 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -404,10 +404,6 @@ void acpi_device_hotplug(struct acpi_device *adev, u32 src) error = dock_notify(adev, src); } else if (adev->flags.hotplug_notify) { error = acpi_generic_hotplug_event(adev, src); - if (error == -EPERM) { - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; - goto err_out; - } } else { int (*notify)(struct acpi_device *, u32); @@ -423,8 +419,20 @@ void acpi_device_hotplug(struct acpi_device *adev, u32 src) else goto out; } - if (!error) + switch (error) { + case 0: ost_code = ACPI_OST_SC_SUCCESS; + break; + case -EPERM: + ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; + break; + case -EBUSY: + ost_code = ACPI_OST_SC_DEVICE_BUSY; + break; + default: + ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; + break; + } err_out: acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |