On Friday, January 26, 2018 9:38:19 AM CET Jia-Ju Bai wrote:
> After checking all possible call chains to genpd_dev_pm_detach() and
> genpd_dev_pm_attach() here,
> my tool finds that these functions are never called in atomic context,
> namely never in an interrupt handler or holding a spinlock.
> Thus mdelay can be replaced with msleep to avoid busy wait.
> 
> This is found by a static analysis tool named DCNS written by myself.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
> ---
>  drivers/base/power/domain.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 0c80bea..f84ac72 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2144,7 +2144,7 @@ static void genpd_dev_pm_detach(struct device *dev, 
> bool power_off)
>               if (ret != -EAGAIN)
>                       break;
>  
> -             mdelay(i);
> +             msleep(i);
>               cond_resched();
>       }
>  
> @@ -2231,7 +2231,7 @@ int genpd_dev_pm_attach(struct device *dev)
>               if (ret != -EAGAIN)
>                       break;
>  
> -             mdelay(i);
> +             msleep(i);
>               cond_resched();
>       }
>       mutex_unlock(&gpd_list_lock);
> 

Ulf, Kevin, any concerns or objections?

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