[Intel-gfx] [PATCH v2 1/3] pwm/core: Don't hold pwm_lookup_lock longer then necessary
Hans de Goede
hdegoede at redhat.com
Sun Jan 22 16:14:07 UTC 2017
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
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