linux-kernel - Re: [PATCH v3] acpi: handle the acpi hotplug schedule error

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Date:   Fri, 07 Jul 2017 15:16:40 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     "Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lee, Chun-Yi" <jlee@...e.com>, Len Brown <lenb@...nel.org>,
        Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v3] acpi: handle the acpi hotplug schedule error

On Friday, July 07, 2017 02:22:42 PM Lee, Chun-Yi wrote:
> Kernel should decrements the reference count of acpi device
> when the scheduling of acpi hotplug work failed, and evaluates
> _OST to notify BIOS the failure.
> 
> v3:
> More simplify the code. (Rafael J. Wysocki)
> 
> v2:
> To simplify the code. (Andy Shevchenko)
> 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Michal Hocko <mhocko@...e.cz>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: "Lee, Chun-Yi" <jlee@...e.com>

This has been applied too AFAICS.

> ---
>  drivers/acpi/bus.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 784bda6..9d4fea6 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -432,11 +432,15 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
>  	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
>  		driver->ops.notify(adev, type);
>  
> -	if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
> +	if (!hotplug_event) {
> +		acpi_bus_put_acpi_device(adev);
> +		return;
> +	}
> +
> +	if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
>  		return;
>  
>  	acpi_bus_put_acpi_device(adev);
> -	return;
>  
>   err:
>  	acpi_evaluate_ost(handle, type, ost_code, NULL);
>