linux-kernel - Re: [PATCH] media: i2c: adv7343: add support for asynchronous probing

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Date:	Sun, 23 Jun 2013 15:26:10 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LMML <linux-media@...r.kernel.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH] media: i2c: adv7343: add support for asynchronous probing

On Sat, 22 Jun 2013, Prabhakar Lad wrote:

> From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
> 
> Both synchronous and asynchronous adv7343 subdevice probing is supported by
> this patch.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Hans Verkuil <hverkuil@...all.nl>
> Cc: Sakari Ailus <sakari.ailus@....fi>
> Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
> ---
>  drivers/media/i2c/adv7343.c |   15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/adv7343.c b/drivers/media/i2c/adv7343.c
> index 7606218..8080c2c 100644
> --- a/drivers/media/i2c/adv7343.c
> +++ b/drivers/media/i2c/adv7343.c
> @@ -27,6 +27,7 @@
>  #include <linux/uaccess.h>
>  
>  #include <media/adv7343.h>
> +#include <media/v4l2-async.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-ctrls.h>
>  
> @@ -445,16 +446,21 @@ static int adv7343_probe(struct i2c_client *client,
>  				       ADV7343_GAIN_DEF);
>  	state->sd.ctrl_handler = &state->hdl;
>  	if (state->hdl.error) {
> -		int err = state->hdl.error;
> -
> -		v4l2_ctrl_handler_free(&state->hdl);
> -		return err;
> +		err = state->hdl.error;
> +		goto done;

What does this have to do with asynchronous probing? Please, remove.

>  	}
>  	v4l2_ctrl_handler_setup(&state->hdl);
>  
>  	err = adv7343_initialize(&state->sd);
>  	if (err)
> +		goto done;
> +
> +	err = v4l2_async_register_subdev(&state->sd);
> +
> +done:

This label won't be needed then either.

Thanks
Guennadi

> +	if (err < 0)
>  		v4l2_ctrl_handler_free(&state->hdl);
> +
>  	return err;
>  }
>  
> @@ -463,6 +469,7 @@ static int adv7343_remove(struct i2c_client *client)
>  	struct v4l2_subdev *sd = i2c_get_clientdata(client);
>  	struct adv7343_state *state = to_state(sd);
>  
> +	v4l2_async_unregister_subdev(&state->sd);
>  	v4l2_device_unregister_subdev(sd);
>  	v4l2_ctrl_handler_free(&state->hdl);
>  
> -- 
> 1.7.9.5
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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