On Fri, Jun 9, 2017 at 1:54 PM, Lee, Chun-Yi <joeyli.kernel@xxxxxxxxx> wrote:
> 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 send kobject change event to userspace and returns busy.
>
> Both of them will returns -EBUSY to acpi device hotplug function then
> hotplug function indicates non-specific failure to platform just like
> any other error, e.g. -ENODEV or -EIO.
>
> The benefit to platform for identifying the OS busy state is that
> platform can be applied different approach to handle the busy but
> not just terminate the hot-remove process by unknown reason. For
> example, platform can wait for a while then triggers hot-remove
> again.
>
> This RFC patch adds one more parameter to the handler function of
> acpi generic hotplug event to give the function a chance to propose
> the return code of _OST. In this case, it sets ost return code to
> ACPI_OST_SC_DEVICE_BUSY when the acpi hot remove function returns
> -EBUSY.
Below looks better for my taste.
See also comments.
> +static int acpi_ost_status_code(u32 src, int error)
> +{
> + switch (src) {
> + case ACPI_NOTIFY_EJECT_REQUEST:
> + case ACPI_OST_EC_OSPM_EJECT:
> + if (error == -EPERM)
> + return ACPI_OST_SC_EJECT_NOT_SUPPORTED;
> + else if (error == -EBUSY)
Redundant else...
> + return ACPI_OST_SC_DEVICE_BUSY;
Perhaps switch case here as well?
switch (error) {
case -EPERM;
return X;
case -EBUSY:
return Y;
}
> + break;
> + }
> + return error ? ACPI_OST_SC_NON_SPECIFIC_FAILURE : ACPI_OST_SC_SUCCESS;
> +}
> + ost_code = acpi_ost_status_code(src, error);
> err_out:
I guess you need to swap those lines.
> acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
--
With Best Regards,
Andy Shevchenko
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