linux-kernel - Re: drm/tinydrm: Fix memory leak in hx8357d

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Message-ID: <4deb2230-eabe-b817-8516-3dfad68d2065@web.de>
Date:   Mon, 28 Oct 2019 19:00:48 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Navid Emamdoost <navid.emamdoost@...il.com>,
        dri-devel@...ts.freedesktop.org
Cc:     Navid Emamdoost <emamd001@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>, Eric Anholt <eric@...olt.net>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: drm/tinydrm: Fix memory leak in hx8357d_probe

> …
>> +free_dbidev:
>> +	kfree(dbidev);
> …
>
> I became curious if there is a need for such a memory release at another place.

I have taken another look also at a related implementation detail.
Now I have realised that the desired clean-up should usually be achieved by
the callback function “mipi_dbi_release” for this software module.
https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/gpu/drm/drm_mipi_dbi.c#L581
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/drm_mipi_dbi.c?id=0365fb6baeb1ebefbbdad9e3f48bab9b3ccb8df3#n581

Regards,
Markus