iio: mcp320x: Fix occasional incorrect readings

Without the cacheline alignment, the readings will occasionally incorrectly
return 0.

Signed-off-by: Michael Welling <mwelling@ieee.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
index efbfd12a4bfdd9f764732d976a2650719408552c..8d9c9b9215ddc1ef5530df512d475a618cb71d8f 100644 (file)
--- a/drivers/iio/adc/mcp320x.c
+++ b/drivers/iio/adc/mcp320x.c
@@ -60,12 +60,12 @@ struct mcp320x {
        struct spi_message msg;
        struct spi_transfer transfer[2];
 
-       u8 tx_buf;
-       u8 rx_buf[2];
-
        struct regulator *reg;
        struct mutex lock;
        const struct mcp320x_chip_info *chip_info;
+
+       u8 tx_buf ____cacheline_aligned;
+       u8 rx_buf[2];
 };
 
 static int mcp320x_channel_to_tx_data(int device_index,