linux-kernel - Re: [PATCH] drm/bridge: ti-sn65dsi83: Fix null pointer dereference in remove callback

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Date:   Fri, 18 Jun 2021 07:40:41 +0200
From:   Marek Vasut <marex@...x.de>
To:     Jonathan Liu <net147@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Linus Walleij <linus.walleij@...aro.org>,
        Frieder Schrempf <frieder.schrempf@...tron.de>
Subject: Re: [PATCH] drm/bridge: ti-sn65dsi83: Fix null pointer dereference in
 remove callback

On 6/18/21 5:06 AM, Jonathan Liu wrote:
> Hi Marek,

Hi,

>> Hi Jonathan,
>>
>> Thank you for the patch.
>>
>> On Thu, Jun 17, 2021 at 09:19:25PM +1000, Jonathan Liu wrote:
>>> If attach has not been called, unloading the driver can result in a null
>>> pointer dereference in mipi_dsi_detach as ctx->dsi has not been assigned
>>> yet.
>>
>> Shouldn't this be done in a brige .detach() operation instead ?
>>
> 
> Could you please take a look?
> I don't have a working setup to test moving the code to detach.

I just replied to your other email regarding bringing the chip up, so 
please bring your setup up first, then test this patch again, and then 
let's revisit this topic.