linux-kernel - Re: [PATCH v6 16/17] media: v4l2: async: Remove notifier subdevs array

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Message-ID: <20180804103354.GB9285@w540>
Date:   Sat, 4 Aug 2018 12:33:54 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>, linux-media@...r.kernel.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Sebastian Reichel <sre@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 16/17] media: v4l2: async: Remove notifier subdevs
 array

Hi Steve,

On Mon, Jul 23, 2018 at 09:44:57AM -0700, Steve Longerbeam wrote:
>
>
> On 07/23/2018 05:35 AM, Sakari Ailus wrote:
> >Hi Steve,
> >
> >Thanks for the update.
> >
> >On Mon, Jul 09, 2018 at 03:39:16PM -0700, Steve Longerbeam wrote:
> >>All platform drivers have been converted to use
> >>v4l2_async_notifier_add_subdev(), in place of adding
> >>asd's to the notifier subdevs array. So the subdevs
> >>array can now be removed from struct v4l2_async_notifier,
> >>and remove the backward compatibility support for that
> >>array in v4l2-async.c.
> >>
> >>Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
> >This set removes the subdevs and num_subdevs fieldsfrom the notifier (as
> >discussed previously) but it doesn't include the corresponding
> >driver changes. Is there a patch missing from the set?
>
> Hi Sakari, yes somehow patch 15/17 (the large patch to all drivers)
> got dropped by the ML, maybe because the cc-list was too big?
>
> I will resend with only linux-media and cc: you.

For the Renesas CEU and Renesas R-Car VIN you can add my:

Tested-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

I would have a very small comment on the renesas-ceu.c patch. I'm copying
the hunk here below as the patch didn't reach the mailing list

>@@ -1562,40 +1557,46 @@ static int ceu_parse_dt(struct ceu_device *ceudev)
>                        dev_err(ceudev->dev,
>                                "No subdevice connected on endpoint %u.\n", i);
>                        ret = -ENODEV;
>-                       goto error_put_node;
>+                       goto error_cleanup;
>                }
>
>                ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &fw_ep);
>                if (ret) {
>                if (ret) {
>                        dev_err(ceudev->dev,
>                                "Unable to parse endpoint #%u.\n", i);
>-                       goto error_put_node;
>+                       goto error_cleanup;
>                }
>
>                if (fw_ep.bus_type != V4L2_MBUS_PARALLEL) {
>                        dev_err(ceudev->dev,
>                                "Only parallel input supported.\n");
>                        ret = -EINVAL;
>-                       goto error_put_node;
>+                       goto error_cleanup;
>                }
>
>                /* Setup the ceu subdevice and the async subdevice. */
>                ceu_sd = &ceudev->subdevs[i];
>                INIT_LIST_HEAD(&ceu_sd->asd.list);
>
>+               remote = of_graph_get_remote_port_parent(ep);
>                ceu_sd->mbus_flags = fw_ep.bus.parallel.flags;
>                ceu_sd->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
>-               ceu_sd->asd.match.fwnode =
>-                       fwnode_graph_get_remote_port_parent(
>-                                       of_fwnode_handle(ep));
>+               ceu_sd->asd.match.fwnode = of_fwnode_handle(remote);
>+
>+               ret = v4l2_async_notifier_add_subdev(&ceudev->notifier,
>+                                                    &ceu_sd->asd);
>+               if (ret) {
>+                       of_node_put(remote);

                        ^^^ The 'remote' device node is only put in
                        the error path
>
>+                       goto error_cleanup;
>+               }
>
>-               ceudev->asds[i] = &ceu_sd->asd;
>                of_node_put(ep);
>        }
>
>        return num_ep;
>
>-error_put_node:
>+error_cleanup:
>+       v4l2_async_notifier_cleanup(&ceudev->notifier);
>        of_node_put(ep);
>        return ret;
> }

Thanks
   j

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