linux-kernel - Re: [RFC PATCH] [media] rc: filter out not allowed protocols when decoding

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Date:	Mon, 3 Sep 2012 14:03:57 +0100
From:	Sean Young <sean@...s.org>
To:	"Du, Changbin" <changbin.du@...il.com>
Cc:	mchehab@...radead.org, paul.gortmaker@...driver.com,
	sfr@...b.auug.org.au, srinivas.kandagatla@...com,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] [media] rc: filter out not allowed protocols when
 decoding

On Sat, Sep 01, 2012 at 09:57:09AM +0800, Du, Changbin wrote:
> From: "Du, Changbin" <changbin.du@...il.com>
> 
> Each rc-raw device has a property "allowed_protos" stored in structure
> ir_raw_event_ctrl. But it didn't work because all decoders would be
> called when decoding. This path makes only allowed protocol decoders
> been invoked.
> 
> Signed-off-by: Du, Changbin <changbin.du@...il.com>
> ---
>  drivers/media/rc/ir-raw.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/rc/ir-raw.c b/drivers/media/rc/ir-raw.c
> index a820251..198b6d8 100644
> --- a/drivers/media/rc/ir-raw.c
> +++ b/drivers/media/rc/ir-raw.c
> @@ -63,8 +63,12 @@ static int ir_raw_event_thread(void *data)
>  		spin_unlock_irq(&raw->lock);
>  
>  		mutex_lock(&ir_raw_handler_lock);
> -		list_for_each_entry(handler, &ir_raw_handler_list, list)
> -			handler->decode(raw->dev, ev);
> +		list_for_each_entry(handler, &ir_raw_handler_list, list) {
> +			/* use all protocol by default */
> +			if (raw->dev->allowed_protos == RC_TYPE_UNKNOWN ||
> +			    raw->dev->allowed_protos & handler->protocols)
> +				handler->decode(raw->dev, ev);
> +		}

Each IR protocol decoder already checks whether it is enabled or not; 
should it not be so that only allowed protocols can be enabled rather 
than checking both enabled_protocols and allowed_protocols?

Just from reading store_protocols it looks like decoders which aren't
in allowed_protocols can be enabled, which makes no sense. Also 
ir_raw_event_register all protocols are enabled rather than the 
allowed ones.

Lastely I don't know why raw ir drivers should dictate which protocols
can be enabled. Would it not be better to remove it entirely?


>  		raw->prev_ev = ev;
>  		mutex_unlock(&ir_raw_handler_lock);
>  	}
> -- 
> 1.7.9.5
> 
> --
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