linux-kernel - Re: [PATCH v2 1/5] i2c: i2c-davinci: switch to use platform_get

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Message-ID: <20141126155431.GK4431@pengutronix.de>
Date:	Wed, 26 Nov 2014 16:54:31 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, Sekhar Nori <nsekhar@...com>,
	linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Mike Looijmans <milo-software@...rs.sourceforge.net>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH v2 1/5] i2c: i2c-davinci: switch to use platform_get_irq

Hello Grygorii,

On Wed, Nov 26, 2014 at 03:59:49PM +0200, Grygorii Strashko wrote:
> Switch Davinci I2C driver to use platform_get_irq(), because
> it is not recommened to use platform_get_resource(pdev, IORESOURCE_IRQ, ..)
> for requesting IRQ resources any more, as they can be not ready yet
> in case of DT-boot.
> 
> CC: Sekhar Nori <nsekhar@...com>
> CC: Kevin Hilman <khilman@...prootsystems.com>
> CC: Santosh Shilimkar <ssantosh@...nel.org>
> CC: Murali Karicheri <m-karicheri2@...com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  drivers/i2c/busses/i2c-davinci.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
> index 4d96147..7f54903 100644
> --- a/drivers/i2c/busses/i2c-davinci.c
> +++ b/drivers/i2c/busses/i2c-davinci.c
> @@ -640,13 +640,17 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  {
>  	struct davinci_i2c_dev *dev;
>  	struct i2c_adapter *adap;
> -	struct resource *mem, *irq;
> -	int r;
> -
> -	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -	if (!irq) {
> -		dev_err(&pdev->dev, "no irq resource?\n");
> -		return -ENODEV;
> +	struct resource *mem;
> +	int r, irq;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq <= 0) {
> +		if (irq == -EPROBE_DEFER)
> +			return irq;
> +		if (!irq)
> +			irq = -ENXIO;
> +		dev_err(&pdev->dev, "can't get irq resource ret=%d\n", irq);
> +		return irq;
The simpler and I think also more usual logic is:

	if (!irq)
		irq = -ENXIO;
	if (irq != -EPROBE_DEFER)
		dev_err(...);
	return irq;

Other than that the patch looks fine.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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