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Date: Mon, 26 Feb 2024 09:49:36 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: "Ricardo B. Marliere" <ricardo@...liere.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] usb: typec: constify the struct device_type usage
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@...liere.net>
Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> 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
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