linux-kernel - Re: [PATCH] media: v4l2-fwnode: Return -EINVAL for invalid bus-type

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Date:   Tue, 15 Sep 2020 18:35:13 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Subject: Re: [PATCH] media: v4l2-fwnode: Return -EINVAL for invalid bus-type

Hi Biju,

Thank you for the review.

On Tue, Sep 15, 2020 at 5:01 PM Biju Das <biju.das.jz@...renesas.com> wrote:
>
> Hi Prabhakar,
>
> Thanks for the patch.
>
> > Subject: [PATCH] media: v4l2-fwnode: Return -EINVAL for invalid bus-type
> >
> > With the current implementation if invalid bus-type is passed via DT
> > v4l2_fwnode_endpoint_parse() defaulted the mus-type to
>
> Typo mus-type??
>
> > V4L2_MBUS_PARALLEL instead of returning error.
> >
> > This Patch adds V4L2_MBUS_INVALID entry to v4l2_mbus_type enum and
>
> This patch ??
>
Argh my bad, will fix that and post a v2.

Cheers,
Prabhakar

> > when invalid bus-type is detected in v4l2_fwnode_endpoint_parse() it
> > returns -EINVAL to the caller.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  drivers/media/v4l2-core/v4l2-fwnode.c | 6 +++++-
> >  include/media/v4l2-mediabus.h         | 2 ++
> >  2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-
> > core/v4l2-fwnode.c
> > index a4c3c77c1894..a6f3549eadd3 100644
> > --- a/drivers/media/v4l2-core/v4l2-fwnode.c
> > +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
> > @@ -93,7 +93,7 @@ v4l2_fwnode_bus_type_to_mbus(enum
> > v4l2_fwnode_bus_type type)
> >  const struct v4l2_fwnode_bus_conv *conv =
> >  get_v4l2_fwnode_bus_conv_by_fwnode_bus(type);
> >
> > -return conv ? conv->mbus_type : V4L2_MBUS_UNKNOWN;
> > +return conv ? conv->mbus_type : V4L2_MBUS_INVALID;
> >  }
> >
> >  static const char *
> > @@ -436,6 +436,10 @@ static int __v4l2_fwnode_endpoint_parse(struct
> > fwnode_handle *fwnode,
> >   v4l2_fwnode_mbus_type_to_string(vep->bus_type),
> >   vep->bus_type);
> >  mbus_type = v4l2_fwnode_bus_type_to_mbus(bus_type);
> > +if (mbus_type == V4L2_MBUS_INVALID) {
> > +pr_debug("unsupported bus type %u\n", bus_type);
> > +return -EINVAL;
> > +}
> >
> >  if (vep->bus_type != V4L2_MBUS_UNKNOWN) {
> >  if (mbus_type != V4L2_MBUS_UNKNOWN && diff --git
> > a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h index
> > 45f88f0248c4..b4f630783cb7 100644
> > --- a/include/media/v4l2-mediabus.h
> > +++ b/include/media/v4l2-mediabus.h
> > @@ -78,6 +78,7 @@
> >   * @V4L2_MBUS_CCP2:CCP2 (Compact Camera Port 2)
> >   * @V4L2_MBUS_CSI2_DPHY: MIPI CSI-2 serial interface, with D-PHY
> >   * @V4L2_MBUS_CSI2_CPHY: MIPI CSI-2 serial interface, with C-PHY
> > + * @V4L2_MBUS_INVALID:invalid bus type (keep it last for sanity)
> >   */
> >  enum v4l2_mbus_type {
> >  V4L2_MBUS_UNKNOWN,
> > @@ -87,6 +88,7 @@ enum v4l2_mbus_type {
> >  V4L2_MBUS_CCP2,
> >  V4L2_MBUS_CSI2_DPHY,
> >  V4L2_MBUS_CSI2_CPHY,
> > +V4L2_MBUS_INVALID,
> >  };
> >
> >  /**
> > --
> > 2.17.1
>
>
>
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