[PATCH 4.14 v3 6/6] iio: counter: 104-quad-8: Fix race condition between FLAG and CNTR reads

[William Breathitt Gray]

The Counter (CNTR) register is 24 bits wide, but we can have an
effective 25-bit count value by setting bit 24 to the XOR of the Borrow
flag and Carry flag. The flags can be read from the FLAG register, but a
race condition exists: the Borrow flag and Carry flag are instantaneous
and could change by the time the count value is read from the CNTR
register.

Since the race condition could result in an incorrect 25-bit count
value, remove support for 25-bit count values from this driver.

Fixes: 28e5d3bb0325 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8")
Cc: <stable@xxxxxxxxxxxxxxx> # 4.14.x
Signed-off-by: William Breathitt Gray <william.gray@xxxxxxxxxx>
---
 drivers/iio/counter/104-quad-8.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/iio/counter/104-quad-8.c b/drivers/iio/counter/104-quad-8.c
index 181585ae..bdb07694 100644
--- a/drivers/iio/counter/104-quad-8.c
+++ b/drivers/iio/counter/104-quad-8.c
@@ -64,9 +64,6 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
 {
 	struct quad8_iio *const priv = iio_priv(indio_dev);
 	const int base_offset = priv->base + 2 * chan->channel;
-	unsigned int flags;
-	unsigned int borrow;
-	unsigned int carry;
 	int i;
 
 	switch (mask) {
@@ -76,12 +73,7 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
 			return IIO_VAL_INT;
 		}
 
-		flags = inb(base_offset + 1);
-		borrow = flags & BIT(0);
-		carry = !!(flags & BIT(1));
-
-		/* Borrow XOR Carry effectively doubles count range */
-		*val = (borrow ^ carry) << 24;
+		*val = 0;
 
 		/* Reset Byte Pointer; transfer Counter to Output Latch */
 		outb(0x11, base_offset + 1);

base-commit: 373c2a0d721acdbed9f45bf9816c04edad3704ca
-- 
2.39.2