linux-kernel - Re: [RFC PATCH v11 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <bacc4308-4b95-f566-b80e-096ff96407b5@gmail.com>
Date:   Thu, 30 Apr 2020 16:56:44 +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 v11 6/9] media: tegra: Add Tegra210 Video input driver

30.04.2020 01:00, Sowjanya Komatineni пишет:
> +static int chan_capture_kthread_finish(void *data)
> +{
> +	struct tegra_vi_channel *chan = data;
> +	struct tegra_channel_buffer *buf;
> +
> +	set_freezable();
> +
> +	while (1) {
> +		try_to_freeze();

I guess it won't be great to freeze in the middle of a capture process, so:
		if (list_empty(&chan->done))
			try_to_freeze();

> +		wait_event_interruptible(chan->done_wait,
> +					 !list_empty(&chan->done) ||
> +					 kthread_should_stop());
> +
> +		/* dequeue buffers and finish capture */
> +		buf = dequeue_buf_done(chan);
> +		while (buf) {
> +			tegra_channel_capture_done(chan, buf);
> +			buf = dequeue_buf_done(chan);
> +		}
> +
> +		if (kthread_should_stop())
> +			break;
> +	}
> +
> +	return 0;
> +}