linux-kernel - Re: [PATCH] Input: evdev - add a schedule point in evdev

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Message-Id: <20181005040836.GU2674@linux.ibm.com>
Date:   Thu, 4 Oct 2018 21:08:36 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: evdev - add a schedule point in evdev_write()

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@...il.com>

Reviewed-by: Paul E. McKenney <paulmck@...ux.ibm.com>

> ---
>  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
>