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

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Date:   Tue, 15 Sep 2020 16:00:57 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     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>
CC:     "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>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: RE: [PATCH] media: v4l2-fwnode: Return -EINVAL for invalid bus-type

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 ??

> 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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