linux-kernel - Re: [PATCH v4 20/36] media: imx: Add CSI subdev driver

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Message-ID: <20170216190931.GV27312@n2100.armlinux.org.uk>
Date:   Thu, 16 Feb 2017 19:09:31 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...hat.com>,
        mark.rutland@....com, andrew-ct.chen@...iatek.com,
        minghsiu.tsai@...iatek.com, sakari.ailus@...ux.intel.com,
        nick@...anahar.org, songjun.wu@...rochip.com,
        Steve Longerbeam <steve_longerbeam@...tor.com>, pavel@....cz,
        robert.jarzmik@...e.fr, devel@...verdev.osuosl.org,
        markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, shuah@...nel.org,
        geert@...ux-m68k.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, kernel@...gutronix.de, arnd@...db.de,
        mchehab@...nel.org, bparrot@...com, robh+dt@...nel.org,
        horms+renesas@...ge.net.au, tiffany.lin@...iatek.com,
        linux-arm-kernel@...ts.infradead.org,
        niklas.soderlund+renesas@...natech.se, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, jean-christophe.trotin@...com,
        p.zabel@...gutronix.de, fabio.estevam@....com, shawnguo@...nel.org,
        sudipm.mukherjee@...il.com
Subject: Re: [PATCH v4 20/36] media: imx: Add CSI subdev driver

On Thu, Feb 16, 2017 at 10:44:16AM -0800, Steve Longerbeam wrote:
> On 02/16/2017 04:40 AM, Russell King - ARM Linux wrote:
> >[    8.012191] imx_media_common: module is from the staging directory, the quality is unknown, you have been warned.
> >[    8.018175] imx_media: module is from the staging directory, the quality is unknown, you have been warned.
> >[    8.748345] imx-media: Registered subdev ipu1_csi0_mux
> >[    8.753451] imx-media: Registered subdev ipu2_csi1_mux
> >[    9.055196] imx219 0-0010: detected IMX219 sensor
> >[    9.090733] imx6_mipi_csi2: module is from the staging directory, the quality is unknown, you have been warned.
> >[    9.092247] imx-media: Registered subdev imx219 0-0010
> >[    9.334338] imx-media: Registered subdev imx6-mipi-csi2
> >[    9.372452] imx_media_capture: module is from the staging directory, the quality is unknown, you have been warned.
> >[    9.378163] imx_media_capture: module is from the staging directory, the quality is unknown, you have been warned.
> >[    9.390033] imx_media_csi: module is from the staging directory, the quality is unknown, you have been warned.
> >[    9.394362] imx-media: Received unknown subdev ipu1_csi0
> 
> The root problem is here. I don't know why the CSI entities are not
> being recognized. Can you share the changes you made?

No, it's not the root problem that's causing the BUG/etc, but it is
_a_ problem.  Nevertheless, it's something I fixed - disconnecting
the of_node from the struct device needed one other change in the
imx-media code that was missing at this time.

However, that's no excuse what so ever for the BUG_ON() and lack of
error cleanup (causing use-after-free, which is just another way of
saying "data corruption waiting to happen") that I identified.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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