linux-kernel - Re: [PATCH v5 02/15] platform/x86: intel_cht_int33fe: Accept errors of i2c_acpi_new

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Date:   Sun, 2 Dec 2018 15:56:06 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 02/15] platform/x86: intel_cht_int33fe: Accept errors
 of i2c_acpi_new_device()

On Wed, 28 Nov 2018 13:45:22 +0200
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> In the future i2c_acpi_new_device() will return error pointer in some cases.
> Prepare intel_cht_int33fe driver to support that.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Really trivial comment inline.  I haven't checked back to see if there
has been any previous discussion on that bit of code.

Otherwise looks sensible to me.

Jonathan



> ---
>  drivers/platform/x86/intel_cht_int33fe.c | 28 +++++++++++++++++++-----
>  1 file changed, 23 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
> index 431151d4e611..367d6e304ade 100644
> --- a/drivers/platform/x86/intel_cht_int33fe.c
> +++ b/drivers/platform/x86/intel_cht_int33fe.c
> @@ -168,8 +168,14 @@ static int cht_int33fe_probe(struct platform_device *pdev)
>  		board_info.dev_name = "max17047";
>  		board_info.properties = max17047_props;
>  		data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
> -		if (!data->max17047)
> -			return -EPROBE_DEFER; /* Wait for i2c-adapter to load */
> +		if (IS_ERR(data->max17047))
> +			ret = PTR_ERR(data->max17047);
Every so slightly nicer to just return directly in these error cases?
> +		else if (!data->max17047)
> +			ret = -EPROBE_DEFER; /* Wait for i2c-adapter to load */
> +		else
> +			ret = 0;

Particularly so as then you don't need to set this ret as it's set in all
paths where it is used below anyway...

> +		if (ret)
> +			return ret;
>  	}
>  
>  	data->connections[0].endpoint[0] = "port0";
> @@ -194,7 +200,13 @@ static int cht_int33fe_probe(struct platform_device *pdev)
>  	board_info.irq = fusb302_irq;
>  
>  	data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info);
> -	if (!data->fusb302)
> +	if (IS_ERR(data->fusb302))
> +		ret = PTR_ERR(data->fusb302);
> +	else if (!data->fusb302)
> +		ret = -EPROBE_DEFER; /* Wait for the i2c-adapter to load */
> +	else
> +		ret = 0;
> +	if (ret)
>  		goto out_unregister_max17047;
>  
>  	memset(&board_info, 0, sizeof(board_info));
> @@ -202,7 +214,13 @@ static int cht_int33fe_probe(struct platform_device *pdev)
>  	strlcpy(board_info.type, "pi3usb30532", I2C_NAME_SIZE);
>  
>  	data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info);
> -	if (!data->pi3usb30532)
> +	if (IS_ERR(data->pi3usb30532))
> +		ret = PTR_ERR(data->pi3usb30532);
> +	else if (!data->pi3usb30532)
> +		ret = -EPROBE_DEFER; /* Wait for the i2c-adapter to load */
> +	else
> +		ret = 0;
> +	if (ret)
>  		goto out_unregister_fusb302;
>  
>  	platform_set_drvdata(pdev, data);
> @@ -217,7 +235,7 @@ static int cht_int33fe_probe(struct platform_device *pdev)
>  
>  	device_connections_remove(data->connections);
>  
> -	return -EPROBE_DEFER; /* Wait for the i2c-adapter to load */
> +	return ret;
>  }
>  
>  static int cht_int33fe_remove(struct platform_device *pdev)