Re: [PATCH] Input: evdev - add a schedule point in evdev_write()

[Paul E. McKenney]

On Thu, Oct 04, 2018 at 05:53:59PM -0700, Dmitry Torokhov wrote:
> Large writes to evdev interface may cause rcu stalls. Let's add
> cond_resched() to the loop to avoid this.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>

> ---
>  drivers/input/evdev.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
> index 370206f987f9..f48369d6f3a0 100644
> --- a/drivers/input/evdev.c
> +++ b/drivers/input/evdev.c
> @@ -564,6 +564,7 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer,
>  
>  		input_inject_event(&evdev->handle,
>  				   event.type, event.code, event.value);
> +		cond_resched();
>  	}
>  
>   out:
> -- 
> 2.19.0.605.g01d371f741-goog
> 
> 
> -- 
> Dmitry
>