net: pse-pd: Add helper to report hardware enable status of the PI

Refactor code by introducing a helper function to retrieve the hardware
enabled state of the PI, avoiding redundant implementations in the
future.

Signed-off-by: Kory Maincent (Dent Project) <[e-mail]>
Reviewed-by: Oleksij Rempel <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/pse-pd/pse_core.c

···
 	return psec->attached_phydev->attached_dev;
 }
 
+/**
+ * pse_pi_is_hw_enabled - Is PI enabled at the hardware level
+ * @pcdev: a pointer to the PSE controller device
+ * @id: Index of the PI
+ *
+ * Return: 1 if the PI is enabled at the hardware level, 0 if not, and
+ *	   a failure value on error
+ */
+static int pse_pi_is_hw_enabled(struct pse_controller_dev *pcdev, int id)
+{
+	struct pse_admin_state admin_state = {0};
+	int ret;
+
+	ret = pcdev->ops->pi_get_admin_state(pcdev, id, &admin_state);
+	if (ret < 0)
+		return ret;
+
+	/* PI is well enabled at the hardware level */
+	if (admin_state.podl_admin_state == ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED ||
+	    admin_state.c33_admin_state == ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED)
+		return 1;
+
+	return 0;
+}
+
 static int pse_pi_is_enabled(struct regulator_dev *rdev)
 {
 	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
-	struct pse_admin_state admin_state = {0};
 	const struct pse_controller_ops *ops;
 	int id, ret;
 
···
 
 	id = rdev_get_id(rdev);
 	mutex_lock(&pcdev->lock);
-	ret = ops->pi_get_admin_state(pcdev, id, &admin_state);
-	if (ret)
-		goto out;
-
-	if (admin_state.podl_admin_state == ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED ||
-	    admin_state.c33_admin_state == ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED)
-		ret = 1;
-
-out:
+	ret = pse_pi_is_hw_enabled(pcdev, id);
 	mutex_unlock(&pcdev->lock);
 
 	return ret;