Re: [PATCH v2 06/10] drm/msm/dp: fix aux-bus EP lifetime

[Doug Anderson]

Hi,

On Tue, Sep 13, 2022 at 9:58 AM Johan Hovold <johan+linaro@xxxxxxxxxx> wrote:
>
> Device-managed resources allocated post component bind must be tied to
> the lifetime of the aggregate DRM device or they will not necessarily be
> released when binding of the aggregate device is deferred.
>
> This can lead resource leaks or failure to bind the aggregate device
> when binding is later retried and a second attempt to allocate the
> resources is made.
>
> For the DP aux-bus, an attempt to populate the bus a second time will
> simply fail ("DP AUX EP device already populated").
>
> Fix this by tying the lifetime of the EP device to the DRM device rather
> than DP controller platform device.
>
> Fixes: c3bf8e21b38a ("drm/msm/dp: Add eDP support via aux_bus")
> Cc: stable@xxxxxxxxxxxxxxx      # 5.19
> Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)

This seems fine to me as a short term fix until we get the DP AUX
populating moved to probe.

Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>