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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2019-11-11 10:03:54 +0100
committerThierry Reding <thierry.reding@gmail.com>2020-01-20 12:29:34 +0100
commit43efdc8f0e6d7088ec61bd55a73bf853f002d043 (patch)
treec926c026c3a54fd09a425b51513768ae0ca6bdbd /drivers/pwm
parent1188829abc2abbef0da7a082fdb6a315a050a0a0 (diff)
downloadlinux-43efdc8f0e6d7088ec61bd55a73bf853f002d043.tar.bz2
pwm: omap-dmtimer: Remove PWM chip in .remove before making it unfunctional
In the old code (e.g.) mutex_destroy() was called before pwmchip_remove(). Between these two calls it is possible that a PWM callback is used which tries to grab the mutex. Fixes: 6604c6556db9 ("pwm: Add PWM driver for OMAP using dual-mode timers") 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.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index 00772fc53490..bdf94c78655f 100644
--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -351,6 +351,11 @@ put:
static int pwm_omap_dmtimer_remove(struct platform_device *pdev)
{
struct pwm_omap_dmtimer_chip *omap = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = pwmchip_remove(&omap->chip);
+ if (ret)
+ return ret;
if (pm_runtime_active(&omap->dm_timer_pdev->dev))
omap->pdata->stop(omap->dm_timer);
@@ -359,7 +364,7 @@ static int pwm_omap_dmtimer_remove(struct platform_device *pdev)
mutex_destroy(&omap->mutex);
- return pwmchip_remove(&omap->chip);
+ return 0;
}
static const struct of_device_id pwm_omap_dmtimer_of_match[] = {