linux-kernel - Re: [PATCH] regulator: regulator disable supply fix

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Date:	Tue, 2 Nov 2010 14:45:26 +0100
From:	Mattias Wallin <mattias.wallin@...ricsson.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Liam Girdwood <lrg@...mlogic.co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: regulator disable supply fix



On 11/02/2010 02:19 PM, Mark Brown wrote:
> On Tue, Nov 02, 2010 at 01:22:29PM +0100, Mattias Wallin wrote:
>> This patch fixes a disable failure when regulator supply is used.
>> A while loop in regulator disable checks for supply pointer != NULL
>> but the pointer is not always updated, resulting in the while loop
>> running too many times causing a disable failure.
> 
>> Signed-off-by: Mattias Wallin <mattias.wallin@...ricsson.com>
> 
> Hrm.  This does fix the problem which is needed so:
> 
> Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> 
>> ---
>>  drivers/regulator/core.c |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
>> index f1d10c9..dc7d36e 100644
>> --- a/drivers/regulator/core.c
>> +++ b/drivers/regulator/core.c
>> @@ -1424,6 +1424,7 @@ int regulator_disable(struct regulator *regulator)
>>  	/* decrease our supplies ref count and disable if required */
>>  	while (supply_rdev != NULL) {
>>  		rdev = supply_rdev;
>> +		supply_rdev = NULL;
>>  
>>  		mutex_lock(&rdev->mutex);
>>  		_regulator_disable(rdev, &supply_rdev);
> 
> but this does smell a bit like it ought to be in the _regulator_disable()
> call rather than the caller.

Would you prefer below solution instead?

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index dc7d36e..51f66b2 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1359,6 +1359,7 @@ static int _regulator_disable(struct regulator_dev *rdev,
                struct regulator_dev **supply_rdev_ptr)
 {
        int ret = 0;
+       *supply_rdev_ptr = NULL;
 
        if (WARN(rdev->use_count <= 0,
                        "unbalanced disables for %s\n",


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