linux-kernel - Re: [PATCH v7 14/34] i2c: tegra: Clean up probe function

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Date:   Thu, 17 Sep 2020 18:02:26 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 14/34] i2c: tegra: Clean up probe function

17.09.2020 15:37, Thierry Reding пишет:
...
>> +	/* interrupt will be enabled during of transfer time */
>> +	irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
                                           ^^^^^^^^^^^^

>> +	ret = devm_request_irq(&pdev->dev, i2c_dev->irq, tegra_i2c_isr,
>> +			       IRQF_NO_SUSPEND, dev_name(&pdev->dev),
>> +			       i2c_dev);
>> +	if (ret)
>> +		return ret;
> 
> Is it safe to install the interrupt handler at this point? What if,
> perhaps because some bootloader didn't properly quiesce the I2C
> controller, an interrupt triggers immediately after this?

This is why we're using the IRQ_NOAUTOEN flag above :)