linux-kernel - Re: [PATCH] i2c: mv64xxx: Fix circular dependencies warning and compilation breakage

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Date:	Fri, 7 Mar 2014 15:24:05 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	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, linux@....linux.org.uk
Subject: Re: [PATCH] i2c: mv64xxx: Fix circular dependencies warning and
 compilation breakage


New patch -> new thread, please.

> This patch fixes the circular dependency introduced by commit 370136bc67c3
> ("i2c: mv64xxx: Add reset deassert call"):
> 
> drivers/video/Kconfig:42:error: recursive dependency detected!

Please base it on i2c-next. I already applied my patch.
Your patch fixes the build error discovered by it.

> Since the reset framework doesn't define dummy stubs whenever
> CONFIG_RESET_CONTROLLER is not defined, it's the only sane way to have a driver
> that compiles in any cases.

Paragraph needs reformat. And please drop "sane". #ifdefs are not sane.
Fixing the reset framework would be sane.

> @@ -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))

Why don't you simply set rstc to some ERR_PTR above if not
RESET_CONTROLLER?


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