1 files changed, 15 insertions, 16 deletions

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index d2c35920ff08..966497d10c6e 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -236,7 +236,7 @@ int pwmchip_add(struct pwm_chip *chip)
 	int ret;
 
 	if (!chip || !chip->dev || !chip->ops || !chip->ops->config ||
-	    !chip->ops->enable || !chip->ops->disable)
+	    !chip->ops->enable || !chip->ops->disable || !chip->npwm)
 		return -EINVAL;
 
 	mutex_lock(&pwm_lock);
@@ -602,12 +602,9 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
 	struct pwm_device *pwm = ERR_PTR(-EPROBE_DEFER);
 	const char *dev_id = dev ? dev_name(dev) : NULL;
 	struct pwm_chip *chip = NULL;
-	unsigned int index = 0;
 	unsigned int best = 0;
-	struct pwm_lookup *p;
+	struct pwm_lookup *p, *chosen = NULL;
 	unsigned int match;
-	unsigned int period;
-	enum pwm_polarity polarity;
 
 	/* look up via DT first */
 	if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
@@ -653,10 +650,7 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
 		}
 
 		if (match > best) {
-			chip = pwmchip_find_by_name(p->provider);
-			index = p->index;
-			period = p->period;
-			polarity = p->polarity;
+			chosen = p;
 
 			if (match != 3)
 				best = match;
@@ -665,17 +659,22 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
 		}
 	}
 
-	mutex_unlock(&pwm_lookup_lock);
+	if (!chosen)
+		goto out;
 
-	if (chip)
-		pwm = pwm_request_from_chip(chip, index, con_id ?: dev_id);
-	if (IS_ERR(pwm))
-		return pwm;
+	chip = pwmchip_find_by_name(chosen->provider);
+	if (!chip)
+		goto out;
 
-	pwm_set_period(pwm, period);
-	pwm_set_polarity(pwm, polarity);
+	pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
+	if (IS_ERR(pwm))
+		goto out;
 
+	pwm_set_period(pwm, chosen->period);
+	pwm_set_polarity(pwm, chosen->polarity);
 
+out:
+	mutex_unlock(&pwm_lookup_lock);
 	return pwm;
 }
 EXPORT_SYMBOL_GPL(pwm_get);