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Subject: Re: [RFC PATCH v6 6/9] media: tegra: Add Tegra210 Video input driver
To:     Dmitry Osipenko <digetx@gmail.com>, <thierry.reding@gmail.com>,
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From:   Sowjanya Komatineni <skomatineni@nvidia.com>
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On 4/5/20 2:11 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 04.04.2020 04:25, Sowjanya Komatineni =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
> ...
>> +static int tegra_vi_tpg_channels_alloc(struct tegra_vi *vi)
>> +{
>> +     struct tegra_vi_channel *chan, *tmp;
>> +     unsigned int port_num;
>> +     unsigned int nchannels =3D vi->soc->vi_max_channels;
>> +     int ret =3D 0;
>> +
>> +     for (port_num =3D 0; port_num < nchannels; port_num++) {
>> +             /*
>> +              * Do not use devm_kzalloc as memory is freed immediately
>> +              * when device instance is unbound but application might s=
till
>> +              * be holding the device node open. Channel memory allocat=
ed
>> +              * with kzalloc is freed during video device release callb=
ack.
>> +              */
>> +             chan =3D kzalloc(sizeof(*chan), GFP_KERNEL);
> Why anyone would want to unbind this driver in practice?
>
> I think it should make more sense to set suppress_bind_attrs=3Dtrue.

 From the previous feedback of patch series, we need to support=20
unbind/bind and looks like this driver should also support to built as a=20
module.