pwm: core: Simplify some devm_*pwm*() functions

Use devm_add_action_or_reset() instead of devres_alloc() and
devres_add(), which works the same. This will simplify the
code. There is no functional changes.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/core.c

@@ -1065,9 +1065,9 @@ void pwm_put(struct pwm_device *pwm)
 }
 EXPORT_SYMBOL_GPL(pwm_put);
 
-static void devm_pwm_release(struct device *dev, void *res)
+static void devm_pwm_release(void *pwm)
 {
-	pwm_put(*(struct pwm_device **)res);
+	pwm_put(pwm);
 }
 
 /**
@@ -1083,19 +1083,16 @@ static void devm_pwm_release(struct device *dev, void *res)
  */
 struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
 {
-	struct pwm_device **ptr, *pwm;
-
-	ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return ERR_PTR(-ENOMEM);
+	struct pwm_device *pwm;
+	int ret;
 
 	pwm = pwm_get(dev, con_id);
-	if (!IS_ERR(pwm)) {
-		*ptr = pwm;
-		devres_add(dev, ptr);
-	} else {
-		devres_free(ptr);
-	}
+	if (IS_ERR(pwm))
+		return pwm;
+
+	ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm);
+	if (ret)
+		return ERR_PTR(ret);
 
 	return pwm;
 }
@@ -1116,19 +1113,16 @@ EXPORT_SYMBOL_GPL(devm_pwm_get);
 struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
 				   const char *con_id)
 {
-	struct pwm_device **ptr, *pwm;
-
-	ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return ERR_PTR(-ENOMEM);
+	struct pwm_device *pwm;
+	int ret;
 
 	pwm = of_pwm_get(dev, np, con_id);
-	if (!IS_ERR(pwm)) {
-		*ptr = pwm;
-		devres_add(dev, ptr);
-	} else {
-		devres_free(ptr);
-	}
+	if (IS_ERR(pwm))
+		return pwm;
+
+	ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm);
+	if (ret)
+		return ERR_PTR(ret);
 
 	return pwm;
 }
@@ -1150,23 +1144,19 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
 				       struct fwnode_handle *fwnode,
 				       const char *con_id)
 {
-	struct pwm_device **ptr, *pwm = ERR_PTR(-ENODEV);
-
-	ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return ERR_PTR(-ENOMEM);
+	struct pwm_device *pwm = ERR_PTR(-ENODEV);
+	int ret;
 
 	if (is_of_node(fwnode))
 		pwm = of_pwm_get(dev, to_of_node(fwnode), con_id);
 	else if (is_acpi_node(fwnode))
 		pwm = acpi_pwm_get(fwnode);
+	if (IS_ERR(pwm))
+		return pwm;
 
-	if (!IS_ERR(pwm)) {
-		*ptr = pwm;
-		devres_add(dev, ptr);
-	} else {
-		devres_free(ptr);
-	}
+	ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm);
+	if (ret)
+		return ERR_PTR(ret);
 
 	return pwm;
 }