[PATCH 3.16.y-ckt 083/118] iio: adc: vf610: fix the adc register read fail issue

[Luis Henriques]

3.16.7-ckt16 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fugang Duan <b38611 at freescale.com>

commit bf604a4c44a91cc2ceb60d4643a091b6b32cc999 upstream.

Read the register only when the adc register address is 4 byte aligned.
(rather than the other way around).

Signed-off-by: Haibo Chen <haibo.chen at freescale.com>
Signed-off-by: Fugang Duan <B38611 at freescale.com>
Signed-off-by: Jonathan Cameron <jic23 at kernel.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/iio/adc/vf610_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 11048473b89e..0062d0e71d03 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -555,7 +555,7 @@ static int vf610_adc_reg_access(struct iio_dev *indio_dev,
 	struct vf610_adc *info = iio_priv(indio_dev);
 
 	if ((readval == NULL) ||
-		(!(reg % 4) || (reg > VF610_REG_ADC_PCTL)))
+		((reg % 4) || (reg > VF610_REG_ADC_PCTL)))
 		return -EINVAL;
 
 	*readval = readl(info->regs + reg);