[PATCH 1/4][Bionic][SRU Artful] i2c: xlp9xx: return ENXIO on slave address NACK

dann frazier dann.frazier at canonical.com
Tue Apr 10 19:29:34 UTC 2018


From: Dmitry Bazhenov <dmitry.bazhenov at auriga.com>

BugLink: https://bugs.launchpad.net/bugs/1762812

Fix the driver violation of the common practice to return
ENXIO error on a slave address NACK.

Signed-off-by: Dmitry Bazhenov <dmitry.bazhenov at auriga.com>
Signed-off-by: George Cherian <george.cherian at cavium.com>
Tested-by: dann frazier <dann.frazier at canonical.com>
Signed-off-by: Wolfram Sang <wsa at the-dreams.de>
(cherry picked from commit c2a3b3cce8df1cafeda2ab03563d7e703c51a4ac)
Signed-off-by: dann frazier <dann.frazier at canonical.com>
---
 drivers/i2c/busses/i2c-xlp9xx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index b970bf8f38e5..6d78cdc5cf91 100644
--- a/drivers/i2c/busses/i2c-xlp9xx.c
+++ b/drivers/i2c/busses/i2c-xlp9xx.c
@@ -324,7 +324,8 @@ static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv, struct i2c_msg *msg,
 		dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err);
 		if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR)
 			xlp9xx_i2c_init(priv);
-		return -EIO;
+		return (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) ?
+			-ENXIO : -EIO;
 	}
 
 	if (timeleft == 0) {
-- 
2.17.0





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