linux-kernel - [PATCH] iio: mcp320x: Fix occasional incorrect readings

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Date:	Tue,  5 May 2015 11:29:55 -0500
From:	Michael Welling <mwelling@...e.org>
To:	jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
	pmeerw@...erw.net, san@...etechnology.dk,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Cc:	Michael Welling <mwelling@...e.org>
Subject: [PATCH] iio: mcp320x: Fix occasional incorrect readings

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

Signed-off-by: Michael Welling <mwelling@...e.org>
---
 drivers/iio/adc/mcp320x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
index efbfd12..46b98cf 100644
--- a/drivers/iio/adc/mcp320x.c
+++ b/drivers/iio/adc/mcp320x.c
@@ -60,7 +60,7 @@ struct mcp320x {
 	struct spi_message msg;
 	struct spi_transfer transfer[2];
 
-	u8 tx_buf;
+	u8 tx_buf ____cacheline_aligned;
 	u8 rx_buf[2];
 
 	struct regulator *reg;
-- 
1.7.9.5

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