On 04.11.2023 23:15, Uwe Kleine-König wrote:
> On today's platforms the benefit of platform_driver_probe() isn't that
> relevant any more. It allows to drop some code after booting (or module
> loading) for .probe() and discard the .remove() function completely if
> the driver is built-in. This typically saves a few 100k.
>
> The downside of platform_driver_probe() is that the driver cannot be
> bound and unbound at runtime which is ancient and so slightly
> complicates testing. There are also thoughts to deprecate
> platform_driver_probe() because it adds some complexity in the driver
> core for little gain. Also many drivers don't use it correctly. This
> driver for example misses to mark the driver struct with __ref which is
> needed to suppress a (W=1) modpost warning.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Reviewed-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxx>
> ---
> drivers/power/reset/at91-poweroff.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c
> index dd5399785b69..83567428ab43 100644
> --- a/drivers/power/reset/at91-poweroff.c
> +++ b/drivers/power/reset/at91-poweroff.c
> @@ -149,7 +149,7 @@ static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev)
> writel(wakeup_mode | mode, at91_shdwc.shdwc_base + AT91_SHDW_MR);
> }
>
> -static int __init at91_poweroff_probe(struct platform_device *pdev)
> +static int at91_poweroff_probe(struct platform_device *pdev)
> {
> struct device_node *np;
> u32 ddr_type;
> @@ -202,7 +202,7 @@ static int __init at91_poweroff_probe(struct platform_device *pdev)
> return ret;
> }
>
> -static int __exit at91_poweroff_remove(struct platform_device *pdev)
> +static int at91_poweroff_remove(struct platform_device *pdev)
> {
> if (pm_power_off == at91_poweroff)
> pm_power_off = NULL;
> @@ -224,13 +224,14 @@ static const struct of_device_id at91_poweroff_of_match[] = {
> MODULE_DEVICE_TABLE(of, at91_poweroff_of_match);
>
> static struct platform_driver at91_poweroff_driver = {
> - .remove = __exit_p(at91_poweroff_remove),
> + .probe = at91_poweroff_probe,
> + .remove = at91_poweroff_remove,
> .driver = {
> .name = "at91-poweroff",
> .of_match_table = at91_poweroff_of_match,
> },
> };
> -module_platform_driver_probe(at91_poweroff_driver, at91_poweroff_probe);
> +module_platform_driver(at91_poweroff_driver);
>
> MODULE_AUTHOR("Atmel Corporation");
> MODULE_DESCRIPTION("Shutdown driver for Atmel SoCs");
