Re: [PATCH 09/10] iio:buffer: Add proper locking for iio_update_buffers()

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On 09/18/13 21:27, Lars-Peter Clausen wrote:
> [...]
>> +int iio_update_buffers(struct iio_dev *indio_dev,
>> +               struct iio_buffer *insert_buffer,
>> +               struct iio_buffer *remove_buffer)
>> +{
>> +    int ret;
>> +
>> +    mutex_lock(&indio_dev->info_exist_lock);
>> +    mutex_lock(&indio_dev->mlock);
>> +
>> +    if (indio_dev->info == NULL)
>> +        return -ENODEV;
> 
> Yea, ok that happens when send patches way to late in the evening. Of course we still need to unlock here...
Any reason not to do the indio_dev->info test before locking in the first place?
> 
>> +    ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer);
>> +
>> +    mutex_unlock(&indio_dev->mlock);
>> +    mutex_unlock(&indio_dev->info_exist_lock);
>> +
>> +    return ret;
>> +}
> 
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