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SubjectRe: [PATCH] MFD : add MAX77686 mfd driver

> + mutex_lock(&max77686->iolock);
> + ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
> + mutex_unlock(&max77686->iolock);

Is it relly necessay to lock whenever you read/write from/to the
i2c bus? Considering also that these are exported function,
someone else may lock here before, so we can have a double
locking on the same mutex.


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