linux-kernel - Re: [PATCH] media: i2c: tvp514x: add support for asynchronous probing

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Message-Id: <201306240911.14288.hverkuil@xs4all.nl>
Date:	Mon, 24 Jun 2013 09:11:14 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
Cc:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	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>,
	Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH] media: i2c: tvp514x: add support for asynchronous probing

On Sun June 23 2013 17:48:20 Prabhakar Lad wrote:
> Hi Guennadi,
> 
> Thanks for the review.
> 
> On Sun, Jun 23, 2013 at 8:49 PM, Guennadi Liakhovetski
> <g.liakhovetski@....de> wrote:
> > On Sat, 22 Jun 2013, Prabhakar Lad wrote:
> >
> >> From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
> >>
> >> Both synchronous and asynchronous tvp514x subdevice probing is supported by
> >> this patch.
> >>
> >> Signed-off-by: Prabhakar Lad <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/tvp514x.c |   22 +++++++++++++++-------
> >>  1 file changed, 15 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/drivers/media/i2c/tvp514x.c b/drivers/media/i2c/tvp514x.c
> >> index 864eb14..d090caf 100644
> >> --- a/drivers/media/i2c/tvp514x.c
> >> +++ b/drivers/media/i2c/tvp514x.c
> >> @@ -36,6 +36,7 @@
> >>  #include <linux/module.h>
> >>  #include <linux/v4l2-mediabus.h>
> >>
> >> +#include <media/v4l2-async.h>
> >>  #include <media/v4l2-device.h>
> >>  #include <media/v4l2-common.h>
> >>  #include <media/v4l2-mediabus.h>
> >
> > Ok, but this one really does too many things in one patch:
> >
> >> @@ -1148,9 +1149,9 @@ tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
> >>       /* Register with V4L2 layer as slave device */
> >>       sd = &decoder->sd;
> >>       v4l2_i2c_subdev_init(sd, client, &tvp514x_ops);
> >> -     strlcpy(sd->name, TVP514X_MODULE_NAME, sizeof(sd->name));
> >>
> >>  #if defined(CONFIG_MEDIA_CONTROLLER)
> >> +     strlcpy(sd->name, TVP514X_MODULE_NAME, sizeof(sd->name));
> >
> > This is unrelated
> >
> OK I'll split the patch or may be a line in a commit message can do ?

Please split it up in two patches.

Why is sd->name set anyway? And why is it moved under CONFIG_MEDIA_CONTROLLER?
It's not obvious to me.

The remainder of the patch makes sense.

Regards,

	Hans

> 
> >>       decoder->pad.flags = MEDIA_PAD_FL_SOURCE;
> >>       decoder->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> >>       decoder->sd.entity.flags |= MEDIA_ENT_T_V4L2_SUBDEV_DECODER;
> >> @@ -1176,16 +1177,22 @@ tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
> >>       sd->ctrl_handler = &decoder->hdl;
> >>       if (decoder->hdl.error) {
> >>               ret = decoder->hdl.error;
> >> -
> >> -             v4l2_ctrl_handler_free(&decoder->hdl);
> >> -             return ret;
> >> +             goto done;
> >>       }
> >>       v4l2_ctrl_handler_setup(&decoder->hdl);
> >>
> >> -     v4l2_info(sd, "%s decoder driver registered !!\n", sd->name);
> >> -
> >> -     return 0;
> >> +     ret = v4l2_async_register_subdev(&decoder->sd);
> >> +     if (!ret)
> >> +             v4l2_info(sd, "%s decoder driver registered !!\n", sd->name);
> >>
> >> +done:
> >> +     if (ret < 0) {
> >> +             v4l2_ctrl_handler_free(&decoder->hdl);
> >> +#if defined(CONFIG_MEDIA_CONTROLLER)
> >> +             media_entity_cleanup(&decoder->sd.entity);
> >
> > So is this - it wasn't called before in the "if (decoder->hdl.error)" case
> > above.
> >
> Yes so fixed it up here.
> 
> Regards,
> --Prabhakar Lad
> --
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