From: Uwe Kleine-König u.kleine-koenig@pengutronix.de
[ Upstream commit 43efdc8f0e6d7088ec61bd55a73bf853f002d043 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/pwm/pwm-omap-dmtimer.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index 2d585c1..c6e710a 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -364,6 +364,11 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) 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); @@ -372,7 +377,7 @@ 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[] = {