| Message ID | 1523347982-29373-1-git-send-email-baijiaju1990@gmail.com (mailing list archive) |
|---|---|
| State | Rejected |
| Delegated to: | Eduardo Valentin |
| Headers | show |
Hey Jia-Ju, On Tue, Apr 10, 2018 at 04:13:02PM +0800, Jia-Ju Bai wrote: > armada370_init_sensor() is never called in atomic context. > > armada370_init_sensor() is set as ".init_sensor" in > struct armada_thermal_data. > ".init_sensor" is called armada_thermal_probe(). > armada_thermal_probe() is set as ".probe" in struct platform_driver. > This function is not called in atomic context. > > Despite never getting called from atomic context, armada370_init_sensor() > calls mdelay() to busily wait. > This is not necessary and can be replaced with usleep_range() to > avoid busy waiting. > > This is found by a static analysis tool named DCNS written by myself. > And I also manually check it. > > Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> > --- > drivers/thermal/armada_thermal.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c > index ae75328..807fe74 100644 > --- a/drivers/thermal/armada_thermal.c > +++ b/drivers/thermal/armada_thermal.c > @@ -113,7 +113,7 @@ static void armada370_init_sensor(struct platform_device *pdev, > reg &= ~PMU_TDC0_START_CAL_MASK; > writel(reg, priv->control); > > - mdelay(10); > + usleep_range(10000, 11000); Cool, but these have been already translated into msleep(): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/thermal/armada_thermal.c#n141 > } > > static void armada375_init_sensor(struct platform_device *pdev, > -- > 1.9.1 >
diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c index ae75328..807fe74 100644 --- a/drivers/thermal/armada_thermal.c +++ b/drivers/thermal/armada_thermal.c @@ -113,7 +113,7 @@ static void armada370_init_sensor(struct platform_device *pdev, reg &= ~PMU_TDC0_START_CAL_MASK; writel(reg, priv->control); - mdelay(10); + usleep_range(10000, 11000); } static void armada375_init_sensor(struct platform_device *pdev,
armada370_init_sensor() is never called in atomic context. armada370_init_sensor() is set as ".init_sensor" in struct armada_thermal_data. ".init_sensor" is called armada_thermal_probe(). armada_thermal_probe() is set as ".probe" in struct platform_driver. This function is not called in atomic context. Despite never getting called from atomic context, armada370_init_sensor() calls mdelay() to busily wait. This is not necessary and can be replaced with usleep_range() to avoid busy waiting. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> --- drivers/thermal/armada_thermal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)