linux-kernel - Re: FW: Regulator API ignored return values

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Message-Id: <201303121403.09315.arnd@arndb.de>
Date:	Tue, 12 Mar 2013 14:03:09 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Kevin Liu <keyuan.liu@...il.com>
Cc:	Chris Ball <cjb@...top.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-arm-kernel@...ts.infradead.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Axel Lin <axel.lin@...ics.com>,
	Jingoo Han <jg1.han@...sung.com>, Felipe Balbi <balbi@...com>,
	Dmitry Torokhov <dtor@...l.ru>, linux-mmc@...r.kernel.org
Subject: Re: FW: Regulator API ignored return values

On Tuesday 12 March 2013, Kevin Liu wrote:
> > -               regulator_enable(host->vqmmc);
> > +               ret = regulator_enable(host->vqmmc);
> >                 if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
> >                         1950000))
> >                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
> >                                         SDHCI_SUPPORT_SDR50 |
> >                                         SDHCI_SUPPORT_DDR50);
> > +               if (ret) {
> > +                       pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> > +                               mmc_hostname(mmc), ret);
> 
> Need add regulator_put here since regulator_get has succeed?

Hmm, we still don't actually bail out if the error is encountered, so
the reference count is balanced with the current patch, but I maybe
a failed regulator_enable() should actually be a fatal error?

If we do that, using devm_regulator_get() would be a nice way to
track the reference counts.

	Arnd
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