linux-kernel - [PATCH 4.10 01/48] iio: 104-quad-8: Fix off-by-one error when addressing flag register

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Message-Id: <20170316142920.839442776@linuxfoundation.org>
Date:   Thu, 16 Mar 2017 23:29:45 +0900
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 4.10 01/48] iio: 104-quad-8: Fix off-by-one error when addressing flag register

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

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

From: William Breathitt Gray <vilhelm.gray@...il.com>

commit ca8d8e03b4c9ad447d1e882cc8014e538f653018 upstream.

The flag register is offset by 1 from the respective channel data
register. This patch fixes an off-by-one error when attempting to read a
channel flag register where the base address was not properly offset.

Fixes: 28e5d3bb0325 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8")
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/counter/104-quad-8.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/counter/104-quad-8.c
+++ b/drivers/iio/counter/104-quad-8.c
@@ -76,7 +76,7 @@ static int quad8_read_raw(struct iio_dev
 			return IIO_VAL_INT;
 		}
 
-		flags = inb(base_offset);
+		flags = inb(base_offset + 1);
 		borrow = flags & BIT(0);
 		carry = !!(flags & BIT(1));