linux-kernel - Re: [PATCH v3] i2c: enable runtime PM for I2C adapter devices enumerated from ACPI

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Date:	Tue, 1 Oct 2013 12:52:09 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	linux-i2c@...r.kernel.org
Cc:	Wolfram Sang <wsa@...-dreams.de>, rjw@...ysocki.net,
	Aaron Lu <aaron.lu@...el.com>, Lv Zheng <lv.zheng@...el.com>,
	Mark Brown <broonie@...nel.org>,
	Kevin Hilman <khilman@...aro.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v3] i2c: enable runtime PM for I2C adapter devices
 enumerated from ACPI

On Mon, Sep 30, 2013 at 05:43:48PM +0300, Mika Westerberg wrote:
> +static void acpi_i2c_device_pm_get(struct i2c_client *client)
> +{
> +	struct i2c_adapter *adap = client->adapter;
> +
> +	/* Make sure the adapter is active */
> +	if (ACPI_HANDLE(adap->dev.parent))
> +		pm_runtime_get_sync(&adap->dev);
> +	if (ACPI_HANDLE(&client->dev))
> +		acpi_dev_pm_attach(&client->dev, true);

There's a bug here as we call acpi_dev_pm_attach() several times. It
doesn't do any harm because acpi_dev_pm_attach() checks if the device is
already attached to the ACPI domain or not.

I'll fix this in the next revision as well.

> +}
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