linux-kernel - Re: [PATCH] i2c: mv64xxx: Fix compilation breakage

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Message-ID: <20140310105808.GE2815@lukather>
Date:	Mon, 10 Mar 2014 11:58:08 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	shuge@...winnertech.com, zhuzhenhua@...winnertech.com
Subject: Re: [PATCH] i2c: mv64xxx: Fix compilation breakage

On Fri, Mar 07, 2014 at 04:08:36PM +0000, Russell King - ARM Linux wrote:
> On Fri, Mar 07, 2014 at 03:59:30PM +0100, Maxime Ripard wrote:
> > @@ -900,7 +902,8 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> >  exit_free_irq:
> >  	free_irq(drv_data->irq, drv_data);
> >  exit_reset:
> > -	if (pd->dev.of_node && !IS_ERR(drv_data->rstc))
> > +	if (pd->dev.of_node && IS_ENABLED(CONFIG_RESET_CONTROLLER) &&
> > +	    !IS_ERR(drv_data->rstc))
> >  		reset_control_assert(drv_data->rstc);
> 
> Another question is... why do we need to check pd->dev.of_node here?
> If CONFIG_RESET_CONTROLLER is set, we always try to get the reset
> controller node, so drv_data->rstc is either going to be a valid
> pointer, or it's going to be an error pointer - neither
> reset_control_get() nor devm_reset_control_get return NULL.

Following back on this as I was doing the patch, actually,
drv_data->rstc will be NULL if we're not probed by DT, and hence never
call reset_control_get, that would set an error pointer.

But then, we can use IS_ERR_OR_NULL on drv_data->rstc.

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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