From: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Date: Wed, 1 Nov 2017 21:05:54 +0000 (-0400)
Subject: media: mxl111sf: improve error handling logic
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ad7b57d58d16666f607914bf9ff6950e1c5532a4;p=openwrt%2Fstaging%2Fblogic.git

media: mxl111sf: improve error handling logic

As reported by smatch:
	drivers/media/usb/dvb-usb-v2/mxl111sf-demod.c:485 mxl111sf_demod_read_signal_strength() error: uninitialized symbol 'modulation'.

The mxl111sf_demod_read_signal_strength() just ignores if something
gets wrong while reading snr or modulation.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---

diff --git a/drivers/media/usb/dvb-usb-v2/mxl111sf-demod.c b/drivers/media/usb/dvb-usb-v2/mxl111sf-demod.c
index f0ed37da73d4..221cf46b4140 100644
--- a/drivers/media/usb/dvb-usb-v2/mxl111sf-demod.c
+++ b/drivers/media/usb/dvb-usb-v2/mxl111sf-demod.c
@@ -477,10 +477,15 @@ static int mxl111sf_demod_read_signal_strength(struct dvb_frontend *fe,
 {
 	struct mxl111sf_demod_state *state = fe->demodulator_priv;
 	enum fe_modulation modulation;
+	int ret;
 	u16 snr;
 
-	mxl111sf_demod_calc_snr(state, &snr);
-	mxl1x1sf_demod_get_tps_modulation(state, &modulation);
+	ret = mxl111sf_demod_calc_snr(state, &snr);
+	if (ret < 0)
+		return ret;
+	ret = mxl1x1sf_demod_get_tps_modulation(state, &modulation);
+	if (ret < 0)
+		return ret;
 
 	switch (modulation) {
 	case QPSK: