diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2023-12-05 10:56:17 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2023-12-20 16:22:50 +0100 |
| commit | 01b571fbbac40bfc266c03e84ab9a8ab2ddd2486 (patch) | |
| tree | cb625fbdf06811f1381b83d488fb4532b68dd6f6 /drivers/pwm | |
| parent | 46cfec2a865ae967ea4366287a7d9a16ad5b8b6f (diff) | |
| download | lwn-01b571fbbac40bfc266c03e84ab9a8ab2ddd2486.tar.gz lwn-01b571fbbac40bfc266c03e84ab9a8ab2ddd2486.zip | |
pwm: omap-dmtimer: Drop locking
The pwm driver only provides a single PWM line, so there are no concurrent
calls of the callbacks from different consumers. A single consumer is
expected not to do concurrent calls into the pwm framework. So there is
nothing to serialize and the lock can go away.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-omap-dmtimer.c | 20 |
1 files changed, 4 insertions, 16 deletions
diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index 13161e08dd6e..496bd73d29fe 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -37,7 +37,6 @@ #include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/mutex.h> #include <linux/of.h> #include <linux/of_platform.h> #include <clocksource/timer-ti-dm.h> @@ -55,7 +54,6 @@ * struct pwm_omap_dmtimer_chip - Structure representing a pwm chip * corresponding to omap dmtimer. * @chip: PWM chip structure representing PWM controller - * @mutex: Mutex to protect pwm apply state * @dm_timer: Pointer to omap dm timer. * @pdata: Pointer to omap dm timer ops. * @dm_timer_pdev: Pointer to omap dm timer platform device @@ -63,7 +61,6 @@ struct pwm_omap_dmtimer_chip { struct pwm_chip chip; /* Mutex to protect pwm apply state */ - struct mutex mutex; struct omap_dm_timer *dm_timer; const struct omap_dm_timer_ops *pdata; struct platform_device *dm_timer_pdev; @@ -277,13 +274,11 @@ static int pwm_omap_dmtimer_apply(struct pwm_chip *chip, const struct pwm_state *state) { struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip); - int ret = 0; - - mutex_lock(&omap->mutex); + int ret; if (pwm_omap_dmtimer_is_enabled(omap) && !state->enabled) { omap->pdata->stop(omap->dm_timer); - goto unlock_mutex; + return 0; } if (pwm_omap_dmtimer_polarity(omap) != state->polarity) @@ -292,7 +287,7 @@ static int pwm_omap_dmtimer_apply(struct pwm_chip *chip, ret = pwm_omap_dmtimer_config(chip, pwm, state->duty_cycle, state->period); if (ret) - goto unlock_mutex; + return ret; if (!pwm_omap_dmtimer_is_enabled(omap) && state->enabled) { omap->pdata->set_pwm(omap->dm_timer, @@ -303,10 +298,7 @@ static int pwm_omap_dmtimer_apply(struct pwm_chip *chip, pwm_omap_dmtimer_start(omap); } -unlock_mutex: - mutex_unlock(&omap->mutex); - - return ret; + return 0; } static const struct pwm_ops pwm_omap_dmtimer_ops = { @@ -404,8 +396,6 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) omap->chip.ops = &pwm_omap_dmtimer_ops; omap->chip.npwm = 1; - mutex_init(&omap->mutex); - ret = pwmchip_add(&omap->chip); if (ret < 0) { dev_err(&pdev->dev, "failed to register PWM\n"); @@ -452,8 +442,6 @@ static void pwm_omap_dmtimer_remove(struct platform_device *pdev) omap->pdata->free(omap->dm_timer); put_device(&omap->dm_timer_pdev->dev); - - mutex_destroy(&omap->mutex); } static const struct of_device_id pwm_omap_dmtimer_of_match[] = { |