linux-kernel - Re: [PATCH 3/3] ARM: omap1/ams-delta: warn about failed regulator enable

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Message-ID: <20160223234044.GW1640@darkstar.musicnaut.iki.fi>
Date:	Wed, 24 Feb 2016 01:40:44 +0200
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Tony Lindgren <tony@...mide.com>,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: omap1/ams-delta: warn about failed regulator
 enable

On Tue, Feb 23, 2016 at 02:57:53PM +0100, Arnd Bergmann wrote:
> The modem pm handler in the ams-delta board uses regulator_enable()
> but does not check for a successful return code:
> 
> board-ams-delta.c:521:3: error: ignoring return value of 'regulator_enable', declared with attribute warn_unused_result [-Werror=unused-result]
> 
> It is not easy to propagate that return code to the callers in
> uart_configure_port/uart_suspend_port/uart_resume_port, unless
> we change all UART drivers, and it is unclear what those would
> do with the return code.
> 
> Instead, this patch uses a runtime warning to replace the
> compiletime warning. I have checked that the regulator in question
> is hardcoded to a fixed-voltage GPIO regulator, and that should
> never fail to get enabled if I understand the code right.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Aaro Koskinen <aaro.koskinen@....fi>

A.