[Intel-gfx] [PATCH v2 1/3] pwm/core: Don't hold pwm_lookup_lock longer then necessary

[Hans de Goede]

There is no need to hold pwm_lookup_lock after we're done with
looping over pwm_lookup_list, so release it earlier.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/pwm/core.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 172ef82..0d3ef29 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -757,9 +757,9 @@ void pwm_remove_table(struct pwm_lookup *table, size_t num)
  */
 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;
+	struct pwm_device *pwm;
+	struct pwm_chip *chip;
 	unsigned int best = 0;
 	struct pwm_lookup *p, *chosen = NULL;
 	unsigned int match;
@@ -817,24 +817,22 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
 		}
 	}
 
-	if (!chosen) {
-		pwm = ERR_PTR(-ENODEV);
-		goto out;
-	}
+	mutex_unlock(&pwm_lookup_lock);
+
+	if (!chosen)
+		return ERR_PTR(-ENODEV);
 
 	chip = pwmchip_find_by_name(chosen->provider);
 	if (!chip)
-		goto out;
+		return ERR_PTR(-EPROBE_DEFER);
 
 	pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
 	if (IS_ERR(pwm))
-		goto out;
+		return pwm;
 
 	pwm->args.period = chosen->period;
 	pwm->args.polarity = chosen->polarity;
 
-out:
-	mutex_unlock(&pwm_lookup_lock);
 	return pwm;
 }
 EXPORT_SYMBOL_GPL(pwm_get);
-- 
2.9.3