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

[Kuogee Hsieh]

On 9/13/2022 5:36 AM, Doug Anderson wrote:
> Hi,
>
> On Tue, Sep 13, 2022 at 9:58 AM Johan Hovold <johan+linaro at kernel.org> 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 at vger.kernel.org      # 5.19
>> Signed-off-by: Johan Hovold <johan+linaro at kernel.org>
>> ---
>>   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 at chromium.org>
Tested-by: Kuogee Hsieh <quic_khsieh at quicinc.com>
Reviewed-by: Kuogee Hsieh <quic_khsieh at quicinc.com>