linux-kernel - [PATCH AUTOSEL 4.19 038/106] media: dvb: return -EREMOTEIO on i2c transfer failure.

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Date:   Mon,  8 Jun 2020 19:21:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Colin Ian King <colin.king@...onical.com>,
        Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 038/106] media: dvb: return -EREMOTEIO on i2c transfer failure.

From: Colin Ian King <colin.king@...onical.com>

[ Upstream commit 96f3a9392799dd0f6472648a7366622ffd0989f3 ]

Currently when i2c transfers fail the error return -EREMOTEIO
is assigned to err but then later overwritten when the tuner
attach call is made.  Fix this by returning early with the
error return code -EREMOTEIO on i2c transfer failure errors.

If the transfer fails, an uninitialized value will be read from b2.

Addresses-Coverity: ("Unused value")

Fixes: fbfee8684ff2 ("V4L/DVB (5651): Dibusb-mb: convert pll handling to properly use dvb-pll")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/dvb-usb/dibusb-mb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb/dibusb-mb.c b/drivers/media/usb/dvb-usb/dibusb-mb.c
index 408920577716..94f59c7765dc 100644
--- a/drivers/media/usb/dvb-usb/dibusb-mb.c
+++ b/drivers/media/usb/dvb-usb/dibusb-mb.c
@@ -84,7 +84,7 @@ static int dibusb_tuner_probe_and_attach(struct dvb_usb_adapter *adap)
 
 	if (i2c_transfer(&adap->dev->i2c_adap, msg, 2) != 2) {
 		err("tuner i2c write failed.");
-		ret = -EREMOTEIO;
+		return -EREMOTEIO;
 	}
 
 	if (adap->fe_adap[0].fe->ops.i2c_gate_ctrl)
-- 
2.25.1