[PATCH v7 1/7] iio: dac: ad5696: properly check i2c_transfer() return value

[Rodrigo Alencar via B4 Relay]

From: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>

Verify that the expected number of i2c messages were transferred when
ad5686_i2c_read() is called. This issue exists since the support for I2C
devices where first introduced.

Fixes: 4177381b4401 ("iio:dac:ad5686: Add AD5671R/75R/94/94R/95R/96/96R support")
Reported-by: sashiko-bot@xxxxxxxxxx
Closes: https://lore.kernel.org/all/20260705114746.1485F1F000E9@xxxxxxxxxxxxxxx/
Signed-off-by: Rodrigo Alencar <rodrigo.alencar@xxxxxxxxxx>
---
 drivers/iio/dac/ad5696-i2c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/dac/ad5696-i2c.c b/drivers/iio/dac/ad5696-i2c.c
index 279309329b64..6f726e6301a6 100644
--- a/drivers/iio/dac/ad5696-i2c.c
+++ b/drivers/iio/dac/ad5696-i2c.c
@@ -40,8 +40,8 @@ static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
 				      0x00);
 
 	ret = i2c_transfer(i2c->adapter, msg, 2);
-	if (ret < 0)
-		return ret;
+	if (ret != 2)
+		return ret < 0 ? ret : -EIO;
 
 	return be16_to_cpu(st->data[0].d16);
 }

-- 
2.43.0