linux-kernel - Re: [PATCH v3] [media] rc-core: fix protocol_change regression in ir_raw_event

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Date:	Tue, 28 Oct 2014 16:50:15 -0200
From:	Mauro Carvalho Chehab <m.chehab@...sung.com>
To:	Tomas Melin <tomas.melin@....fi>
Cc:	david@...deman.nu, james.hogan@...tec.com, a.seppala@...il.com,
	bay@...kerdom.ru, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] [media] rc-core: fix protocol_change regression in
 ir_raw_event_register

Em Tue, 28 Oct 2014 20:43:14 +0200
Tomas Melin <tomas.melin@....fi> escreveu:

> IR receiver using nuvoton-cir and lirc required additional configuration
> steps after upgrade from kernel 3.16 to 3.17-rcX.
> Bisected regression to commit da6e162d6a4607362f8478c715c797d84d449f8b
> ("[media] rc-core: simplify sysfs code").
> 
> The regression comes from adding function change_protocol in
> ir-raw.c. It changes behaviour so that only the protocol enabled by driver's
> map_name will be active after registration. This breaks user space behaviour,
> lirc does not get key press signals anymore.
> 
> Enable lirc protocol by default for ir raw decoders to restore original behaviour.

Yeah, this patch looks ok on my eyes.

Regards,
Mauro

> 
> Signed-off-by: Tomas Melin <tomas.melin@....fi>
> ---
>  drivers/media/rc/rc-ir-raw.c |    1 -
>  drivers/media/rc/rc-main.c   |    2 ++
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
> index e8fff2a..b732ac6 100644
> --- a/drivers/media/rc/rc-ir-raw.c
> +++ b/drivers/media/rc/rc-ir-raw.c
> @@ -262,7 +262,6 @@ int ir_raw_event_register(struct rc_dev *dev)
>  		return -ENOMEM;
>  
>  	dev->raw->dev = dev;
> -	dev->enabled_protocols = ~0;
>  	dev->change_protocol = change_protocol;
>  	rc = kfifo_alloc(&dev->raw->kfifo,
>  			 sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
> diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
> index a7991c7..8d3b74c 100644
> --- a/drivers/media/rc/rc-main.c
> +++ b/drivers/media/rc/rc-main.c
> @@ -1421,6 +1421,8 @@ int rc_register_device(struct rc_dev *dev)
>  
>  	if (dev->change_protocol) {
>  		u64 rc_type = (1 << rc_map->rc_type);
> +		if (dev->driver_type == RC_DRIVER_IR_RAW)
> +			rc_type |= RC_BIT_LIRC;
>  		rc = dev->change_protocol(dev, &rc_type);
>  		if (rc < 0)
>  			goto out_raw;
--
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