On Thu, 16 May 2013 05:28:26 +0000 (GMT) Jingoo Han <jg1....@samsung.com> wrote:
> These functions allow the driver core to automatically clean up any
> allocation made by backlight drivers. Thus it simplifies the error
> paths.
>
> ...
>
> --- a/drivers/video/backlight/backlight.c
> +++ b/drivers/video/backlight/backlight.c
> @@ -370,6 +370,81 @@ void backlight_device_unregister(struct backlight_device
> *bd)
> }
> EXPORT_SYMBOL(backlight_device_unregister);
>
> +static void devm_backlight_device_release(struct device *dev, void *res)
> +{
> + struct backlight_device *backlight = *(struct backlight_device **)res;
> +
> + backlight_device_unregister(backlight);
> +}
>
> ...
>
> +struct backlight_device *devm_backlight_device_register(struct device *dev,
> + const char *name, struct device *parent, void *devdata,
> + const struct backlight_ops *ops,
> + const struct backlight_properties *props)
> +{
> + struct backlight_device **ptr, *backlight;
> +
> + ptr = devres_alloc(devm_backlight_device_release, sizeof(*ptr),
> + GFP_KERNEL);
Well this is an awkward-looking thing. We allocate a silly little 4-
or 8-byte object just to track the backlight_device* via the devres
system.
I assume this was done so that devres could be used as a wrapper around
the existing code?
Really it would be better if things like backlight_device_register()
were themselves directly converted to use devm_foo(), yes?
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