linux-kernel - Re: [PATCH 1/2] regulator: Remove possible deadlock from regulator

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Message-ID: <4D90D1DE.2030202@codeaurora.org>
Date:	Mon, 28 Mar 2011 11:22:22 -0700
From:	David Collins <collinsd@...eaurora.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Liam Girdwood <lrg@...mlogic.co.uk>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH 1/2] regulator: Remove possible deadlock from regulator_enable

On 03/28/2011 11:11 AM, Mark Brown wrote:

>> -/* locks held by regulator_enable() */
>> +/* Locks are *not* held by regulator_enable(). */
>>  static int _regulator_enable(struct regulator_dev *rdev)
>>  {
>> -	int ret, delay;
>> +	struct regulator_dev *supply_rdev = NULL;
>> +	int ret = 0, delay;
>>  
>> +	mutex_lock(&rdev->mutex);
> 
> This is going to be terribly confusing - the _ versions of the functions
> all by convention rely on their callers taking the mutex, allowing them
> to be safely used from internal APIs.  

_regulator_enable is only being called within regulator_enable and
_regulator_enable.  Would it remove the confusion to rename
_regulator_enable to something different?

-David

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
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