Re: [PATCH v2 15/18] ACPI: platform_profile: Remove platform_profile_handler from exported symbols

Ilpo Järvinen
2025-01-14T16:55:44Z

On Tue, 14 Jan 2025, Kurt Borja wrote:

> In order to protect the platform_profile_handler from API consumers,
> allocate it in platform_profile_register() and modify it's signature
> accordingly.
>
> Remove the platform_profile_handler from all consumer drivers and
> replace them with a pointer to the class device, which is
> now returned from platform_profile_register().
>
> Replace *pprof with a pointer to the class device in the rest of
> exported symbols.
>
> Signed-off-by: Kurt Borja <kuurtb@gmail.com>
> ---
> drivers/acpi/platform_profile.c | 87 ++++++++++++-------
> .../surface/surface_platform_profile.c | 11 ++-
> drivers/platform/x86/acer-wmi.c | 18 ++--
> drivers/platform/x86/amd/pmf/pmf.h | 2 +-
> drivers/platform/x86/amd/pmf/sps.c | 17 ++--
> drivers/platform/x86/asus-wmi.c | 20 ++---
> drivers/platform/x86/dell/alienware-wmi.c | 9 +-
> drivers/platform/x86/dell/dell-pc.c | 22 ++---
> drivers/platform/x86/hp/hp-wmi.c | 19 ++--
> drivers/platform/x86/ideapad-laptop.c | 14 +--
> .../platform/x86/inspur_platform_profile.c | 9 +-
> drivers/platform/x86/thinkpad_acpi.c | 14 ++-
> include/linux/platform_profile.h | 12 ++-
> 13 files changed, 125 insertions(+), 129 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 34e22b006ccc..2fae5e2fc962 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -4,6 +4,7 @@
>
> #include <linux/acpi.h>
> #include <linux/bits.h>
> +#include <linux/cleanup.h>
> #include <linux/init.h>
> #include <linux/kdev_t.h>
> #include <linux/mutex.h>
> @@ -213,9 +214,17 @@ static struct attribute *profile_attrs[] = {
> };
> ATTRIBUTE_GROUPS(profile);
>
> +static void pprof_device_release(struct device *dev)
> +{
> + struct platform_profile_handler *pprof = to_pprof_handler(dev);
> +
> + kfree(pprof);
> +}
> +
> static const struct class platform_profile_class = {
> .name = "platform-profile",
> .dev_groups = profile_groups,
> + .dev_release = pprof_device_release,
> };
>
> /**
> @@ -409,10 +418,10 @@ static const struct attribute_group platform_profile_group = {
> .is_visible = profile_class_is_visible,
> };
>
> -void platform_profile_notify(struct platform_profile_handler *pprof)
> +void platform_profile_notify(struct device *dev)
> {
> scoped_cond_guard(mutex_intr, return, &profile_lock) {
> - _notify_class_profile(&pprof->class_dev, NULL);
> + _notify_class_profile(dev, NULL);
> }
> sysfs_notify(acpi_kobj, NULL, "platform_profile");
> }
> @@ -461,40 +470,51 @@ int platform_profile_cycle(void)
> }
> EXPORT_SYMBOL_GPL(platform_profile_cycle);
>
> -int platform_profile_register(struct platform_profile_handler *pprof, void *drvdata)
> +struct device *platform_profile_register(struct device *dev, const char *name,
> + void *drvdata,
> + const struct platform_profile_ops *ops)
> {
> + int minor;
> int err;
>
> - /* Sanity check the profile handler */
> - if (!pprof || !pprof->ops->profile_set || !pprof->ops->profile_get ||
> - !pprof->ops->probe) {
> + /* Sanity check */
> + if (!dev || !name || !ops || !ops->profile_get ||
> + !ops->profile_set || !ops->probe) {
> pr_err("platform_profile: handler is invalid\n");
> - return -EINVAL;
> + return ERR_PTR(-EINVAL);
> }
>
> - err = pprof->ops->probe(drvdata, pprof->choices);
> + struct platform_profile_handler *pprof __free(kfree) = kzalloc(
> + sizeof(*pprof), GFP_KERNEL);
> + if (!pprof)
> + return ERR_PTR(-ENOMEM);
> +
> + err = ops->probe(drvdata, pprof->choices);
> if (err < 0)
> - return err;
> + return ERR_PTR(err);
>
> if (bitmap_empty(pprof->choices, PLATFORM_PROFILE_LAST)) {
> pr_err("platform_profile: no available profiles\n");
> - return -EINVAL;
> + return ERR_PTR(-EINVAL);
> }
>
> guard(mutex)(&profile_lock);
>
> /* create class interface for individual handler */
> - pprof->minor = ida_alloc(&platform_profile_ida, GFP_KERNEL);
> - if (pprof->minor < 0)
> - return pprof->minor;
> + minor = ida_alloc(&platform_profile_ida, GFP_KERNEL);
> + if (minor < 0)
> + return ERR_PTR(minor);
>
> + pprof->name = name;
> + pprof->ops = ops;
> + pprof->minor = minor;
> pprof->class_dev.class = &platform_profile_class;
> - pprof->class_dev.parent = pprof->dev;
> + pprof->class_dev.parent = dev;
> dev_set_drvdata(&pprof->class_dev, drvdata);
> dev_set_name(&pprof->class_dev, "platform-profile-%d", pprof->minor);
> err = device_register(&pprof->class_dev);
> if (err) {
> - put_device(&pprof->class_dev);
> + put_device(&no_free_ptr(pprof)->class_dev);
> goto cleanup_ida;
> }
>
> @@ -504,20 +524,21 @@ int platform_profile_register(struct platform_profile_handler *pprof, void *drvd
> if (err)
> goto cleanup_cur;
>
> - return 0;
> + return &no_free_ptr(pprof)->class_dev;
>
> cleanup_cur:
> - device_unregister(&pprof->class_dev);
> + device_unregister(&no_free_ptr(pprof)->class_dev);

I don't like how this is architected.

IMO, no_free_ptr() should not appear on error/rollback paths. The pointer
is going to be freed despite the code just told it's not going to be
freed, which sends conflicting signals. Obviously, it is because this
function has relinquished its ownership of the pointer but as is it seems
a dangerous/confusing pattern.

> cleanup_ida:
> - ida_free(&platform_profile_ida, pprof->minor);
> + ida_free(&platform_profile_ida, minor);
>
> - return err;
> + return ERR_PTR(err);
> }
> EXPORT_SYMBOL_GPL(platform_profile_register);
>
> -int platform_profile_remove(struct platform_profile_handler *pprof)
> +int platform_profile_remove(struct device *dev)
> {
> + struct platform_profile_handler *pprof = to_pprof_handler(dev);
> int id;
> guard(mutex)(&profile_lock);
>
> @@ -535,30 +556,32 @@ EXPORT_SYMBOL_GPL(platform_profile_remove);
>
> static void devm_platform_profile_release(struct device *dev, void *res)
> {
> - struct platform_profile_handler **pprof = res;
> + struct device **ppdev = res;
>
> - platform_profile_remove(*pprof);
> + platform_profile_remove(*ppdev);
> }
>
> -int devm_platform_profile_register(struct platform_profile_handler *pprof, void *drvdata)
> +struct device *devm_platform_profile_register(struct device *dev, const char *name,
> + void *drvdata,
> + const struct platform_profile_ops *ops)
> {
> - struct platform_profile_handler **dr;
> - int ret;
> + struct device *ppdev;
> + struct device **dr;
>
> dr = devres_alloc(devm_platform_profile_release, sizeof(*dr), GFP_KERNEL);
> if (!dr)
> - return -ENOMEM;
> + return ERR_PTR(-ENOMEM);
>
> - ret = platform_profile_register(pprof, drvdata);
> - if (ret) {
> + ppdev = platform_profile_register(dev, name, drvdata, ops);
> + if (IS_ERR(dev)) {
> devres_free(dr);
> - return ret;
> + return ppdev;
> }
>
> - *dr = pprof;
> - devres_add(pprof->dev, dr);
> + *dr = ppdev;
> + devres_add(dev, dr);
>
> - return 0;
> + return ppdev;
> }
> EXPORT_SYMBOL_GPL(devm_platform_profile_register);
>
> diff --git a/drivers/platform/surface/surface_platform_profile.c b/drivers/platform/surface/surface_platform_profile.c
> index bbdc873cb788..275269a6efc1 100644
> --- a/drivers/platform/surface/surface_platform_profile.c
> +++ b/drivers/platform/surface/surface_platform_profile.c
> @@ -40,7 +40,7 @@ struct ssam_tmp_profile_info {
>
> struct ssam_platform_profile_device {
> struct ssam_device *sdev;
> - struct platform_profile_handler handler;
> + struct device *ppdev;
> bool has_fan;
> };
>
> @@ -228,13 +228,12 @@ static int surface_platform_profile_probe(struct ssam_device *sdev)
> tpd->sdev = sdev;
> ssam_device_set_drvdata(sdev, tpd);
>
> - tpd->handler.name = "Surface Platform Profile";
> - tpd->handler.dev = &sdev->dev;
> - tpd->handler.ops = &ssam_platform_profile_ops;
> -
> tpd->has_fan = device_property_read_bool(&sdev->dev, "has_fan");
>
> - return devm_platform_profile_register(&tpd->handler, tpd);
> + tpd->ppdev = devm_platform_profile_register(

Extra space.

> + &sdev->dev, "Surface Platform Profile", tpd, &ssam_platform_profile_ops);

Could you try to split the line differently.

> +
> + return PTR_ERR_OR_ZERO(tpd->ppdev);
> }
>
> static const struct ssam_device_id ssam_platform_profile_match[] = {
> diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> index 39ec236b7cdb..3e39465b3783 100644
> --- a/drivers/platform/x86/acer-wmi.c
> +++ b/drivers/platform/x86/acer-wmi.c
> @@ -758,7 +758,7 @@ static const struct dmi_system_id non_acer_quirks[] __initconst = {
> {}
> };
>
> -static struct platform_profile_handler platform_profile_handler;
> +static struct device *platform_profile_device;
> static bool platform_profile_support;
>
> /*
> @@ -1937,16 +1937,10 @@ static const struct platform_profile_ops acer_predator_v4_platform_profile_ops =
> static int acer_platform_profile_setup(struct platform_device *device)
> {
> if (quirks->predator_v4) {
> - int err;
> -
> - platform_profile_handler.name = "acer-wmi";
> - platform_profile_handler.dev = &device->dev;
> - platform_profile_handler.ops =
> - &acer_predator_v4_platform_profile_ops;
> -
> - err = devm_platform_profile_register(&platform_profile_handler, NULL);
> - if (err)
> - return err;
> + platform_profile_device = devm_platform_profile_register(
> + &device->dev, "acer-wmi", NULL, &acer_predator_v4_platform_profile_ops);
> + if (IS_ERR(platform_profile_device))
> + return PTR_ERR(platform_profile_device);
>
> platform_profile_support = true;
>
> @@ -2033,7 +2027,7 @@ static int acer_thermal_profile_change(void)
> if (tp != ACER_PREDATOR_V4_THERMAL_PROFILE_TURBO_WMI)
> last_non_turbo_profile = tp;
>
> - platform_profile_notify(&platform_profile_handler);
> + platform_profile_notify(platform_profile_device);
> }
>
> return 0;
> diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
> index d99b3556205b..41b2b91b8fdc 100644
> --- a/drivers/platform/x86/amd/pmf/pmf.h
> +++ b/drivers/platform/x86/amd/pmf/pmf.h
> @@ -338,7 +338,7 @@ struct amd_pmf_dev {
> struct mutex lock; /* protects the PMF interface */
> u32 supported_func;
> enum platform_profile_option current_profile;
> - struct platform_profile_handler pprof;
> + struct device *ppdev; /* platform profile class device */
> struct dentry *dbgfs_dir;
> int hb_interval; /* SBIOS heartbeat interval */
> struct delayed_work heart_beat;
> diff --git a/drivers/platform/x86/amd/pmf/sps.c b/drivers/platform/x86/amd/pmf/sps.c
> index 7c7ed2b9de01..a96fc6887cf0 100644
> --- a/drivers/platform/x86/amd/pmf/sps.c
> +++ b/drivers/platform/x86/amd/pmf/sps.c
> @@ -404,8 +404,6 @@ static const struct platform_profile_ops amd_pmf_profile_ops = {
>
> int amd_pmf_init_sps(struct amd_pmf_dev *dev)
> {
> - int err;
> -
> dev->current_profile = PLATFORM_PROFILE_BALANCED;
>
> if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) {
> @@ -420,15 +418,12 @@ int amd_pmf_init_sps(struct amd_pmf_dev *dev)
> amd_pmf_set_sps_power_limits(dev);
> }
>
> - dev->pprof.name = "amd-pmf";
> - dev->pprof.dev = dev->dev;
> - dev->pprof.ops = &amd_pmf_profile_ops;
> -
> /* Create platform_profile structure and register */
> - err = devm_platform_profile_register(&dev->pprof, dev);
> - if (err)
> - dev_err(dev->dev, "Failed to register SPS support, this is most likely an SBIOS bug: %d\n",
> - err);
> + dev->ppdev = devm_platform_profile_register(
> + dev->dev, "amd-pmf", dev, &amd_pmf_profile_ops);
> + if (IS_ERR(dev->ppdev))
> + dev_err(dev->dev, "Failed to register SPS support, this is most likely an SBIOS bug: %ld\n",
> + PTR_ERR(dev->ppdev));
>
> - return err;
> + return PTR_ERR_OR_ZERO(dev->ppdev);
> }
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index f8437cff66df..4ad99cf9df1a 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -313,7 +313,7 @@ struct asus_wmi {
> bool mid_fan_curve_available;
> struct fan_curve_data custom_fan_curves[3];
>
> - struct platform_profile_handler platform_profile_handler;
> + struct device *platform_profile_device;

Using both ppdev vs platform_profile_device for the same thing seems
inconsistent. The long name also caused a few line split issues for you.

> bool platform_profile_support;
>
> // The RSOC controls the maximum charging percentage.
> @@ -3789,7 +3789,7 @@ static ssize_t throttle_thermal_policy_store(struct device *dev,
> * Ensure that platform_profile updates userspace with the change to ensure
> * that platform_profile and throttle_thermal_policy_mode are in sync.
> */
> - platform_profile_notify(&asus->platform_profile_handler);
> + platform_profile_notify(asus->platform_profile_device);
>
> return count;
> }
> @@ -3891,17 +3891,13 @@ static int platform_profile_setup(struct asus_wmi *asus)
>
> dev_info(dev, "Using throttle_thermal_policy for platform_profile support\n");
>
> - asus->platform_profile_handler.name = "asus-wmi";
> - asus->platform_profile_handler.dev = dev;
> - asus->platform_profile_handler.ops = &asus_wmi_platform_profile_ops;
> + asus->platform_profile_device = devm_platform_profile_register(
> + dev, "asus-wmi", asus, &asus_wmi_platform_profile_ops);
> + if (IS_ERR(asus->platform_profile_device)) {
> + pr_err("%s, failed at devm_platform_profile_register: %ld\n",
> + __func__, PTR_ERR(asus->platform_profile_device));
>
> - err = devm_platform_profile_register(&asus->platform_profile_handler, asus);
> - if (err == -EEXIST) {
> - pr_warn("%s, a platform_profile handler is already registered\n", __func__);
> - return 0;
> - } else if (err) {
> - pr_err("%s, failed at devm_platform_profile_register: %d\n", __func__, err);
> - return err;
> + return PTR_ERR(asus->platform_profile_device);
> }
>
> asus->platform_profile_support = true;
> diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
> index 0146d2f93be6..99db93846a63 100644
> --- a/drivers/platform/x86/dell/alienware-wmi.c
> +++ b/drivers/platform/x86/dell/alienware-wmi.c
> @@ -1135,11 +1135,12 @@ static const struct platform_profile_ops awcc_platform_profile_ops = {
>
> static int create_thermal_profile(struct platform_device *platform_device)
> {
> - pp_handler.name = "alienware-wmi";
> - pp_handler.dev = &platform_device->dev;
> - pp_handler.ops = &awcc_platform_profile_ops;
> + struct device *ppdev;
>
> - return devm_platform_profile_register(&pp_handler, NULL);
> + ppdev = devm_platform_profile_register(
> + &platform_device->dev, "alienware-wmi", NULL, &awcc_platform_profile_ops);

Not a good linesplit (there are other similar problems).

> +
> + return PTR_ERR_OR_ZERO(ppdev);
> }
>
> /*
> diff --git a/drivers/platform/x86/dell/dell-pc.c b/drivers/platform/x86/dell/dell-pc.c
> index 2759bb608b1a..8d60e1b223de 100644
> --- a/drivers/platform/x86/dell/dell-pc.c
> +++ b/drivers/platform/x86/dell/dell-pc.c
> @@ -109,8 +109,6 @@ MODULE_DEVICE_TABLE(dmi, dell_device_table);
> #define DELL_ACC_SET_FIELD GENMASK(11, 8)
> #define DELL_THERMAL_SUPPORTED GENMASK(3, 0)
>
> -static struct platform_profile_handler *thermal_handler;
> -
> enum thermal_mode_bits {
> DELL_BALANCED = BIT(0),
> DELL_COOL_BOTTOM = BIT(1),
> @@ -254,6 +252,7 @@ static const struct platform_profile_ops dell_pc_platform_profile_ops = {
>
> static int thermal_init(void)
> {
> + struct device *ppdev;
> int ret;
>
> /* If thermal commands are not supported, exit without error */
> @@ -271,26 +270,17 @@ static int thermal_init(void)
> if (IS_ERR(platform_device))
> return PTR_ERR(platform_device);
>
> - thermal_handler = devm_kzalloc(&platform_device->dev, sizeof(*thermal_handler), GFP_KERNEL);
> - if (!thermal_handler) {
> - ret = -ENOMEM;
> - goto cleanup_platform_device;
> - }
> - thermal_handler->name = "dell-pc";
> - thermal_handler->dev = &platform_device->dev;
> - thermal_handler->ops = &dell_pc_platform_profile_ops;
> -
> /* Clean up if failed */
> - ret = devm_platform_profile_register(thermal_handler, NULL);
> - if (ret)
> + ppdev = devm_platform_profile_register(
> + &platform_device->dev, "dell-pc", NULL, &dell_pc_platform_profile_ops);
> + if (IS_ERR(ppdev)) {
> + ret = PTR_ERR(ppdev);
> goto cleanup_thermal_handler;
> + }
>
> return 0;
>
> cleanup_thermal_handler:
> - thermal_handler = NULL;
> -
> -cleanup_platform_device:
> platform_device_unregister(platform_device);
>
> return ret;
> diff --git a/drivers/platform/x86/hp/hp-wmi.c b/drivers/platform/x86/hp/hp-wmi.c
> index 1304dfc65aab..d1f9bd287986 100644
> --- a/drivers/platform/x86/hp/hp-wmi.c
> +++ b/drivers/platform/x86/hp/hp-wmi.c
> @@ -273,7 +273,7 @@ static DEFINE_MUTEX(active_platform_profile_lock);
> static struct input_dev *hp_wmi_input_dev;
> static struct input_dev *camera_shutter_input_dev;
> static struct platform_device *hp_wmi_platform_dev;
> -static struct platform_profile_handler platform_profile_handler;
> +static struct device *platform_profile_device;
> static struct notifier_block platform_power_source_nb;
> static enum platform_profile_option active_platform_profile;
> static bool platform_profile_support;
> @@ -1602,6 +1602,7 @@ static const struct platform_profile_ops hp_wmi_platform_profile_ops = {
>
> static int thermal_profile_setup(struct platform_device *device)
> {
> + const struct platform_profile_ops *ops;
> int err, tp;
>
> if (is_omen_thermal_profile()) {
> @@ -1617,7 +1618,7 @@ static int thermal_profile_setup(struct platform_device *device)
> if (err < 0)
> return err;
>
> - platform_profile_handler.ops = &platform_profile_omen_ops;
> + ops = &platform_profile_omen_ops;
> } else if (is_victus_thermal_profile()) {
> err = platform_profile_victus_get_ec(&active_platform_profile);
> if (err < 0)
> @@ -1631,7 +1632,7 @@ static int thermal_profile_setup(struct platform_device *device)
> if (err < 0)
> return err;
>
> - platform_profile_handler.ops = &platform_profile_victus_ops;
> + ops = &platform_profile_victus_ops;
> } else {
> tp = thermal_profile_get();
>
> @@ -1646,15 +1647,13 @@ static int thermal_profile_setup(struct platform_device *device)
> if (err)
> return err;
>
> - platform_profile_handler.ops = &hp_wmi_platform_profile_ops;
> + ops = &hp_wmi_platform_profile_ops;
> }
>
> - platform_profile_handler.name = "hp-wmi";
> - platform_profile_handler.dev = &device->dev;
> -
> - err = devm_platform_profile_register(&platform_profile_handler, NULL);
> - if (err)
> - return err;
> + platform_profile_device = devm_platform_profile_register(
> + &device->dev, "hp-wmi", NULL, ops);
> + if (IS_ERR(platform_profile_device))
> + return PTR_ERR(platform_profile_device);
>
> platform_profile_support = true;
>
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index 87c1e087770a..6065a7421a02 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -142,7 +142,7 @@ enum {
>
> struct ideapad_dytc_priv {
> enum platform_profile_option current_profile;
> - struct platform_profile_handler pprof;
> + struct device *ppdev; /* platform profile device */
> struct mutex mutex; /* protects the DYTC interface */
> struct ideapad_private *priv;
> };
> @@ -1050,7 +1050,7 @@ static void dytc_profile_refresh(struct ideapad_private *priv)
>
> if (profile != priv->dytc->current_profile) {
> priv->dytc->current_profile = profile;
> - platform_profile_notify(&priv->dytc->pprof);
> + platform_profile_notify(priv->dytc->ppdev);
> }
> }
>
> @@ -1117,15 +1117,15 @@ static int ideapad_dytc_profile_init(struct ideapad_private *priv)
>
> mutex_init(&priv->dytc->mutex);
>
> - priv->dytc->pprof.name = "ideapad-laptop";
> - priv->dytc->pprof.dev = &priv->platform_device->dev;
> priv->dytc->priv = priv;
> - priv->dytc->pprof.ops = &dytc_profile_ops;
>
> /* Create platform_profile structure and register */
> - err = devm_platform_profile_register(&priv->dytc->pprof, &priv->dytc);
> - if (err)
> + priv->dytc->ppdev = devm_platform_profile_register(
> + &priv->platform_device->dev, "ideapad-laptop", &priv->dytc, &dytc_profile_ops);
> + if (IS_ERR(priv->dytc->ppdev)) {
> + err = PTR_ERR(priv->dytc->ppdev);
> goto pp_reg_failed;
> + }
>
> /* Ensure initial values are correct */
> dytc_profile_refresh(priv);
> diff --git a/drivers/platform/x86/inspur_platform_profile.c b/drivers/platform/x86/inspur_platform_profile.c
> index e1631de6ad86..8b71c4242939 100644
> --- a/drivers/platform/x86/inspur_platform_profile.c
> +++ b/drivers/platform/x86/inspur_platform_profile.c
> @@ -32,7 +32,7 @@ enum inspur_tmp_profile {
>
> struct inspur_wmi_priv {
> struct wmi_device *wdev;
> - struct platform_profile_handler handler;
> + struct device *ppdev;
> };
>
> static int inspur_wmi_perform_query(struct wmi_device *wdev,
> @@ -190,11 +190,10 @@ static int inspur_wmi_probe(struct wmi_device *wdev, const void *context)
> priv->wdev = wdev;
> dev_set_drvdata(&wdev->dev, priv);
>
> - priv->handler.name = "inspur-wmi";
> - priv->handler.dev = &wdev->dev;
> - priv->handler.ops = &inspur_platform_profile_ops;
> + priv->ppdev = devm_platform_profile_register(
> + &wdev->dev, "inspur-wmi", priv, &inspur_platform_profile_ops);
>
> - return devm_platform_profile_register(&priv->handler, priv);
> + return PTR_ERR_OR_ZERO(priv->ppdev);
> }
>
> static const struct wmi_device_id inspur_wmi_id_table[] = {
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 54ff3e6b8b1a..2a3dd0d149a1 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -962,6 +962,7 @@ static const struct proc_ops dispatch_proc_ops = {
> static struct platform_device *tpacpi_pdev;
> static struct platform_device *tpacpi_sensors_pdev;
> static struct device *tpacpi_hwmon;
> +static struct device *tpacpi_pprof;
> static struct input_dev *tpacpi_inputdev;
> static struct mutex tpacpi_inputdev_send_mutex;
> static LIST_HEAD(tpacpi_all_drivers);
> @@ -10553,11 +10554,6 @@ static const struct platform_profile_ops dytc_profile_ops = {
> .profile_set = dytc_profile_set,
> };
>
> -static struct platform_profile_handler dytc_profile = {
> - .name = "thinkpad-acpi",
> - .ops = &dytc_profile_ops,
> -};
> -
> static void dytc_profile_refresh(void)
> {
> enum platform_profile_option profile;
> @@ -10586,7 +10582,7 @@ static void dytc_profile_refresh(void)
> err = convert_dytc_to_profile(funcmode, perfmode, &profile);
> if (!err && profile != dytc_current_profile) {
> dytc_current_profile = profile;
> - platform_profile_notify(&dytc_profile);
> + platform_profile_notify(tpacpi_pprof);
> }
> }
>
> @@ -10647,14 +10643,14 @@ static int tpacpi_dytc_profile_init(struct ibm_init_struct *iibm)
> dbg_printk(TPACPI_DBG_INIT,
> "DYTC version %d: thermal mode available\n", dytc_version);
>
> - dytc_profile.dev = &tpacpi_pdev->dev;
> /* Create platform_profile structure and register */
> - err = devm_platform_profile_register(&dytc_profile, NULL);
> + tpacpi_pprof = devm_platform_profile_register(
> + &tpacpi_pdev->dev, "thinkpad-acpi", NULL, &dytc_profile_ops);
> /*
> * If for some reason platform_profiles aren't enabled
> * don't quit terminally.
> */
> - if (err)
> + if (IS_ERR(tpacpi_pprof))
> return -ENODEV;
>
> /* Ensure initial values are correct */
> diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h
> index 5ad1ab7b75e4..778d4c661c3c 100644
> --- a/include/linux/platform_profile.h
> +++ b/include/linux/platform_profile.h
> @@ -45,10 +45,14 @@ struct platform_profile_handler {
> const struct platform_profile_ops *ops;
> };
>
> -int platform_profile_register(struct platform_profile_handler *pprof, void *drvdata);
> -int platform_profile_remove(struct platform_profile_handler *pprof);
> -int devm_platform_profile_register(struct platform_profile_handler *pprof, void *drvdata);
> +struct device *platform_profile_register(struct device *dev, const char *name,
> + void *drvdata,
> + const struct platform_profile_ops *ops);
> +int platform_profile_remove(struct device *dev);
> +struct device *devm_platform_profile_register(struct device *dev, const char *name,
> + void *drvdata,
> + const struct platform_profile_ops *ops);
> int platform_profile_cycle(void);
> -void platform_profile_notify(struct platform_profile_handler *pprof);
> +void platform_profile_notify(struct device *dev);
>
> #endif /*_PLATFORM_PROFILE_H_*/
>

--
i.