Re: [PATCH 1/4] usb: typec: constify the struct device_type usage

[Heikki Krogerus]

On Sun, Feb 18, 2024 at 04:18:09PM -0300, Ricardo B. Marliere wrote:
> Since commit aed65af1cc2f ("drivers: make device_type const"), the driver
> core can properly handle constant struct device_type. Move all the
> device_type variables in use by the driver to be constant structures as
> well, placing it into read-only memory which can not be modified at
> runtime.
> 
> Signed-off-by: Ricardo B. Marliere <ricardo@xxxxxxxxxxxx>

Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>

> ---
>  drivers/usb/typec/pd.c | 30 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/usb/typec/pd.c b/drivers/usb/typec/pd.c
> index b9cca2be76fc..d78c04a421bc 100644
> --- a/drivers/usb/typec/pd.c
> +++ b/drivers/usb/typec/pd.c
> @@ -157,7 +157,7 @@ static const struct attribute_group source_fixed_supply_group = {
>  };
>  __ATTRIBUTE_GROUPS(source_fixed_supply);
>  
> -static struct device_type source_fixed_supply_type = {
> +static const struct device_type source_fixed_supply_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = source_fixed_supply_groups,
> @@ -182,7 +182,7 @@ static const struct attribute_group sink_fixed_supply_group = {
>  };
>  __ATTRIBUTE_GROUPS(sink_fixed_supply);
>  
> -static struct device_type sink_fixed_supply_type = {
> +static const struct device_type sink_fixed_supply_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = sink_fixed_supply_groups,
> @@ -213,7 +213,7 @@ static struct attribute *source_variable_supply_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(source_variable_supply);
>  
> -static struct device_type source_variable_supply_type = {
> +static const struct device_type source_variable_supply_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = source_variable_supply_groups,
> @@ -227,7 +227,7 @@ static struct attribute *sink_variable_supply_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(sink_variable_supply);
>  
> -static struct device_type sink_variable_supply_type = {
> +static const struct device_type sink_variable_supply_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = sink_variable_supply_groups,
> @@ -258,7 +258,7 @@ static struct attribute *source_battery_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(source_battery);
>  
> -static struct device_type source_battery_type = {
> +static const struct device_type source_battery_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = source_battery_groups,
> @@ -272,7 +272,7 @@ static struct attribute *sink_battery_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(sink_battery);
>  
> -static struct device_type sink_battery_type = {
> +static const struct device_type sink_battery_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = sink_battery_groups,
> @@ -339,7 +339,7 @@ static struct attribute *source_pps_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(source_pps);
>  
> -static struct device_type source_pps_type = {
> +static const struct device_type source_pps_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = source_pps_groups,
> @@ -353,7 +353,7 @@ static struct attribute *sink_pps_attrs[] = {
>  };
>  ATTRIBUTE_GROUPS(sink_pps);
>  
> -static struct device_type sink_pps_type = {
> +static const struct device_type sink_pps_type = {
>  	.name = "pdo",
>  	.release = pdo_release,
>  	.groups = sink_pps_groups,
> @@ -371,30 +371,30 @@ static const char * const apdo_supply_name[] = {
>  	[APDO_TYPE_PPS]  = "programmable_supply",
>  };
>  
> -static struct device_type *source_type[] = {
> +static const struct device_type *source_type[] = {
>  	[PDO_TYPE_FIXED] = &source_fixed_supply_type,
>  	[PDO_TYPE_BATT]  = &source_battery_type,
>  	[PDO_TYPE_VAR]   = &source_variable_supply_type,
>  };
>  
> -static struct device_type *source_apdo_type[] = {
> +static const struct device_type *source_apdo_type[] = {
>  	[APDO_TYPE_PPS]  = &source_pps_type,
>  };
>  
> -static struct device_type *sink_type[] = {
> +static const struct device_type *sink_type[] = {
>  	[PDO_TYPE_FIXED] = &sink_fixed_supply_type,
>  	[PDO_TYPE_BATT]  = &sink_battery_type,
>  	[PDO_TYPE_VAR]   = &sink_variable_supply_type,
>  };
>  
> -static struct device_type *sink_apdo_type[] = {
> +static const struct device_type *sink_apdo_type[] = {
>  	[APDO_TYPE_PPS]  = &sink_pps_type,
>  };
>  
>  /* REVISIT: Export when EPR_*_Capabilities need to be supported. */
>  static int add_pdo(struct usb_power_delivery_capabilities *cap, u32 pdo, int position)
>  {
> -	struct device_type *type;
> +	const struct device_type *type;
>  	const char *name;
>  	struct pdo *p;
>  	int ret;
> @@ -460,7 +460,7 @@ static void pd_capabilities_release(struct device *dev)
>  	kfree(to_usb_power_delivery_capabilities(dev));
>  }
>  
> -static struct device_type pd_capabilities_type = {
> +static const struct device_type pd_capabilities_type = {
>  	.name = "capabilities",
>  	.release = pd_capabilities_release,
>  };
> @@ -575,7 +575,7 @@ static void pd_release(struct device *dev)
>  	kfree(pd);
>  }
>  
> -static struct device_type pd_type = {
> +static const struct device_type pd_type = {
>  	.name = "usb_power_delivery",
>  	.release = pd_release,
>  	.groups = pd_groups,
> 
> -- 
> 2.43.0

-- 
heikki