linux-kernel - Re: [PATCH] power/reset: at91-poweroff: Fix error handling and other compiler warnings

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Message-ID: <20141013110043.GY19438@lukather>
Date:	Mon, 13 Oct 2014 13:00:43 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: Re: [PATCH] power/reset: at91-poweroff: Fix error handling and other
 compiler warnings

On Fri, Oct 10, 2014 at 05:41:17PM -0700, Guenter Roeck wrote:
> at91_poweroff_get_wakeup_mode can return a negative error code and should
> therefore not return an enum type. Similar, its result should not be
> assigned to an enum type. Otherwise, the returned value is never negative,
> resulting in a compiler warning and a missed error condition, which in turn
> results in writing bad values into a chip register.
> 
> Also fix other compiler warnings which can be easily avoided.
> 
> drivers/power/reset/at91-poweroff.c:74:24:
> 	warning: type qualifiers ignored on function return type
> drivers/power/reset/at91-poweroff.c:74:24:
> 	warning: no previous prototype for 'at91_poweroff_get_wakeup_mode'
> drivers/power/reset/at91-poweroff.c:83:16:
> 	warning: comparison between signed and unsigned integer expressions
> drivers/power/reset/at91-poweroff.c:97:2:
> 	warning: comparison of unsigned expression < 0 is always false
> 
> Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Cc: Nicolas Ferre <nicolas.ferre@...el.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Thanks!
Maxime

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

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