linux-kernel - Re: [PATCH 2/2] [media] rc-core: change enabled

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Date:	Tue, 21 Oct 2014 20:44:28 +0300
From:	Tomas Melin <tomas.melin@....fi>
To:	David Härdeman <david@...deman.nu>
Cc:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	james.hogan@...tec.com,
	Antti Seppälä <a.seppala@...il.com>,
	linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] [media] rc-core: change enabled_protocol default setting

On Mon, Oct 20, 2014 at 5:12 PM, David Härdeman <david@...deman.nu> wrote:
> On 2014-10-19 12:21, Tomas Melin wrote:
>>
>> Change default setting for enabled protocols.
>> Instead of enabling all protocols, disable all except lirc during
>> registration.
>> Reduces overhead since all protocols not handled by default.
>> Protocol to use will be enabled when keycode table is written by
>> userspace.
>
>
> I can see the appeal in this, but now you've disabled automatic decoding for
> the protocol specified by the keymap for raw drivers? So this would also be
> a change, right?

Yes, you are right. Atleast it potentially still could change expected
behaviour.

>
> I agree with Mauro that the "proper" long-term fix would be to teach the
> LIRC userspace daemon to enable the lirc protocol as/when necessary, but
> something similar to the patch below (but lirc + keymap protocol...if that's
> possible to implement in a non-intrusive manner, I haven't checked TBH)
> might be a good idea as an interim measure?
>
I think it looks feasible to implement that way. I'll look in to it
and send a new patch series.

Tomas

>
>
>>
>> Signed-off-by: Tomas Melin <tomas.melin@....fi>
>> ---
>>  drivers/media/rc/rc-ir-raw.c |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
>> index a118539..63d23d0 100644
>> --- a/drivers/media/rc/rc-ir-raw.c
>> +++ b/drivers/media/rc/rc-ir-raw.c
>> @@ -256,7 +256,8 @@ int ir_raw_event_register(struct rc_dev *dev)
>>                 return -ENOMEM;
>>
>>         dev->raw->dev = dev;
>> -       dev->enabled_protocols = ~0;
>> +       /* by default, disable all but lirc*/
>> +       dev->enabled_protocols = RC_BIT_LIRC;
>>         rc = kfifo_alloc(&dev->raw->kfifo,
>>                          sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
>>                          GFP_KERNEL);
--
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