Re: [PATCH v6 09/22] ACPI: platform_profile: Use `scoped_cond_guard`

[Armin Wolf <W_Armin@gmx.de>]

Am 09.11.24 um 05:41 schrieb Mario Limonciello:

> Migrate away from using an interruptible mutex to scoped_cond_guard
> in all functions. While changing, move the sysfs notification
> used in platform_profile_store() outside of mutex scope.

Reviewed-by: Armin Wolf <W_Armin@gmx.de>

> Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>   drivers/acpi/platform_profile.c | 111 +++++++++++++-------------------
>   1 file changed, 43 insertions(+), 68 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 9729543df6333..32affb75e782d 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -27,25 +27,20 @@ static ssize_t platform_profile_choices_show(struct device *dev,
>   					char *buf)
>   {
>   	int len = 0;
> -	int err, i;
> -
> -	err = mutex_lock_interruptible(&profile_lock);
> -	if (err)
> -		return err;
> -
> -	if (!cur_profile) {
> -		mutex_unlock(&profile_lock);
> -		return -ENODEV;
> -	}
> -
> -	for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) {
> -		if (len == 0)
> -			len += sysfs_emit_at(buf, len, "%s", profile_names[i]);
> -		else
> -			len += sysfs_emit_at(buf, len, " %s", profile_names[i]);
> +	int i;
> +
> +	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> +		if (!cur_profile)
> +			return -ENODEV;
> +		for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) {
> +			if (len == 0)
> +				len += sysfs_emit_at(buf, len, "%s", profile_names[i]);
> +			else
> +				len += sysfs_emit_at(buf, len, " %s", profile_names[i]);
> +		}
>   	}
>   	len += sysfs_emit_at(buf, len, "\n");
> -	mutex_unlock(&profile_lock);
> +
>   	return len;
>   }
>
> @@ -56,20 +51,15 @@ static ssize_t platform_profile_show(struct device *dev,
>   	enum platform_profile_option profile = PLATFORM_PROFILE_BALANCED;
>   	int err;
>
> -	err = mutex_lock_interruptible(&profile_lock);
> -	if (err)
> -		return err;
> +	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> +		if (!cur_profile)
> +			return -ENODEV;
>
> -	if (!cur_profile) {
> -		mutex_unlock(&profile_lock);
> -		return -ENODEV;
> +		err = cur_profile->profile_get(cur_profile, &profile);
> +		if (err)
> +			return err;
>   	}
>
> -	err = cur_profile->profile_get(cur_profile, &profile);
> -	mutex_unlock(&profile_lock);
> -	if (err)
> -		return err;
> -
>   	/* Check that profile is valid index */
>   	if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))
>   		return -EIO;
> @@ -88,28 +78,21 @@ static ssize_t platform_profile_store(struct device *dev,
>   	if (i < 0)
>   		return -EINVAL;
>
> -	err = mutex_lock_interruptible(&profile_lock);
> -	if (err)
> -		return err;
> +	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> +		if (!cur_profile)
> +			return -ENODEV;
>
> -	if (!cur_profile) {
> -		mutex_unlock(&profile_lock);
> -		return -ENODEV;
> -	}
> +		/* Check that platform supports this profile choice */
> +		if (!test_bit(i, cur_profile->choices))
> +			return -EOPNOTSUPP;
>
> -	/* Check that platform supports this profile choice */
> -	if (!test_bit(i, cur_profile->choices)) {
> -		mutex_unlock(&profile_lock);
> -		return -EOPNOTSUPP;
> +		err = cur_profile->profile_set(cur_profile, i);
> +		if (err)
> +			return err;
>   	}
>
> -	err = cur_profile->profile_set(cur_profile, i);
> -	if (!err)
> -		sysfs_notify(acpi_kobj, NULL, "platform_profile");
> +	sysfs_notify(acpi_kobj, NULL, "platform_profile");
>
> -	mutex_unlock(&profile_lock);
> -	if (err)
> -		return err;
>   	return count;
>   }
>
> @@ -140,36 +123,28 @@ int platform_profile_cycle(void)
>   	enum platform_profile_option next;
>   	int err;
>
> -	err = mutex_lock_interruptible(&profile_lock);
> -	if (err)
> -		return err;
> +	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> +		if (!cur_profile)
> +			return -ENODEV;
>
> -	if (!cur_profile) {
> -		mutex_unlock(&profile_lock);
> -		return -ENODEV;
> -	}
> +		err = cur_profile->profile_get(cur_profile, &profile);
> +		if (err)
> +			return err;
>
> -	err = cur_profile->profile_get(cur_profile, &profile);
> -	if (err) {
> -		mutex_unlock(&profile_lock);
> -		return err;
> -	}
> +		next = find_next_bit_wrap(cur_profile->choices, PLATFORM_PROFILE_LAST,
> +					  profile + 1);
>
> -	next = find_next_bit_wrap(cur_profile->choices, PLATFORM_PROFILE_LAST,
> -				  profile + 1);
> +		if (WARN_ON(next == PLATFORM_PROFILE_LAST))
> +			return -EINVAL;
>
> -	if (WARN_ON(next == PLATFORM_PROFILE_LAST)) {
> -		mutex_unlock(&profile_lock);
> -		return -EINVAL;
> +		err = cur_profile->profile_set(cur_profile, next);
> +		if (err)
> +			return err;
>   	}
>
> -	err = cur_profile->profile_set(cur_profile, next);
> -	mutex_unlock(&profile_lock);
> -
> -	if (!err)
> -		sysfs_notify(acpi_kobj, NULL, "platform_profile");
> +	sysfs_notify(acpi_kobj, NULL, "platform_profile");
>
> -	return err;
> +	return 0;
>   }
>   EXPORT_SYMBOL_GPL(platform_profile_cycle);
>