linux-kernel - Re: [RFC PATCH v6 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <40102767-ecdb-e958-66f4-45d11464069c@gmail.com>
Date:   Mon, 6 Apr 2020 00:11:27 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, helen.koike@...labora.com
Cc:     sboyd@...nel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v6 6/9] media: tegra: Add Tegra210 Video input driver

04.04.2020 04:25, Sowjanya Komatineni пишет:
...
> +static int tegra_vi_tpg_channels_alloc(struct tegra_vi *vi)
> +{
> +	struct tegra_vi_channel *chan, *tmp;
> +	unsigned int port_num;
> +	unsigned int nchannels = vi->soc->vi_max_channels;
> +	int ret = 0;
> +
> +	for (port_num = 0; port_num < nchannels; port_num++) {
> +		/*
> +		 * Do not use devm_kzalloc as memory is freed immediately
> +		 * when device instance is unbound but application might still
> +		 * be holding the device node open. Channel memory allocated
> +		 * with kzalloc is freed during video device release callback.
> +		 */
> +		chan = 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=true.