linux-kernel - Re: [PATCH 2/4] Input: make events() method return number of events processed

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Message-ID: <my7tmdbjskljxhp5vdu6cervetpwvalqmgeg3g4yfgzxereqqx@cidajfox7dzr>
Date: Mon, 1 Jul 2024 09:37:39 +0200
From: Benjamin Tissoires <bentiss@...nel.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, Jeff LaBundy <jeff@...undy.com>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] Input: make events() method return number of events
 processed

On Jun 30 2024, Dmitry Torokhov wrote:
> In preparation to consolidating filtering and event processing in the
> input core change events() method to return number of events processed
> by it.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/evdev.c | 6 ++++--
>  include/linux/input.h | 7 ++++---
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
> index 51e0c4954600..c8eca8cdb976 100644
> --- a/drivers/input/evdev.c
> +++ b/drivers/input/evdev.c
> @@ -288,8 +288,8 @@ static void evdev_pass_values(struct evdev_client *client,
>  /*
>   * Pass incoming events to all connected clients.
>   */
> -static void evdev_events(struct input_handle *handle,
> -			 const struct input_value *vals, unsigned int count)
> +static unsigned int evdev_events(struct input_handle *handle,
> +				 struct input_value *vals, unsigned int count)
>  {
>  	struct evdev *evdev = handle->private;
>  	struct evdev_client *client;
> @@ -306,6 +306,8 @@ static void evdev_events(struct input_handle *handle,
>  			evdev_pass_values(client, vals, count, ev_time);
>  
>  	rcu_read_unlock();
> +
> +	return count;
>  }
>  
>  /*
> diff --git a/include/linux/input.h b/include/linux/input.h
> index c22ac465254b..89a0be6ee0e2 100644
> --- a/include/linux/input.h
> +++ b/include/linux/input.h
> @@ -275,7 +275,8 @@ struct input_handle;
>   *	it may not sleep
>   * @events: event sequence handler. This method is being called by
>   *	input core with interrupts disabled and dev->event_lock
> - *	spinlock held and so it may not sleep
> + *	spinlock held and so it may not sleep. The method must return
> + *	number of events passed to it.
>   * @filter: similar to @event; separates normal event handlers from
>   *	"filters".
>   * @match: called after comparing device's id with handler's id_table
> @@ -312,8 +313,8 @@ struct input_handler {
>  	void *private;
>  
>  	void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
> -	void (*events)(struct input_handle *handle,
> -		       const struct input_value *vals, unsigned int count);
> +	unsigned int (*events)(struct input_handle *handle,
> +			       struct input_value *vals, unsigned int count);
>  	bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
>  	bool (*match)(struct input_handler *handler, struct input_dev *dev);
>  	int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
> -- 
> 2.45.2.803.g4e1b14247a-goog
> 

Reviewed-by: Benjamin Tissoires <bentiss@...nel.org>

Cheers,
Benjamin