linux-kernel - Re: [PATCH v1 1/6] eeprom: Add a simple EEPROM framework for eeprom providers

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Message-ID: <20150307150035.GN28806@sirena.org.uk>
Date:	Sat, 7 Mar 2015 15:00:35 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Kumar Gala <galak@...eaurora.org>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Stephen Boyd <sboyd@...eaurora.org>, andrew@...n.ch,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v1 1/6] eeprom: Add a simple EEPROM framework for eeprom
 providers

On Thu, Mar 05, 2015 at 09:45:41AM +0000, Srinivas Kandagatla wrote:

> +
> +	return eeprom;
> +}
> +EXPORT_SYMBOL(eeprom_register);

This framework uses regmap but regmap is EXPORT_SYMBOL_GPL() and this is
using EXPORT_SYMBOL().

> +int eeprom_unregister(struct eeprom_device *eeprom)
> +{
> +	mutex_lock(&eeprom_mutex);
> +	if (atomic_read(&eeprom->users)) {
> +		mutex_unlock(&eeprom_mutex);

Atomic reads and a mutex - isn't the mutex enough?  Atomics are
generally a recipie for bugs due to the complexity in using them.

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