linux-kernel - [PATCH] usb: dvb: check status of mxl111sf_read

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Date:   Tue, 25 Dec 2018 23:58:09 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Michael Krufky <mkrufky@...uxtv.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: dvb: check status of mxl111sf_read_reg

When mxl111sf_read_reg fails, we shouldn't use "mode". The fix checks
its return value using mxl_fail

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/media/usb/dvb-usb-v2/mxl111sf-phy.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb-v2/mxl111sf-phy.c b/drivers/media/usb/dvb-usb-v2/mxl111sf-phy.c
index ffb6e7c72f57..aecc3d02fc1e 100644
--- a/drivers/media/usb/dvb-usb-v2/mxl111sf-phy.c
+++ b/drivers/media/usb/dvb-usb-v2/mxl111sf-phy.c
@@ -130,7 +130,8 @@ int mxl111sf_config_mpeg_in(struct mxl111sf_state *state,
 	mxl_fail(ret);
 
 	/* Configure MPEG Clock phase */
-	mxl111sf_read_reg(state, V6_MPEG_IN_CLK_INV_REG, &mode);
+	ret = mxl111sf_read_reg(state, V6_MPEG_IN_CLK_INV_REG, &mode);
+	mxl_fail(ret);
 
 	if (clock_phase == TSIF_NORMAL)
 		mode &= ~V6_INVERTED_CLK_PHASE;
-- 
2.17.2 (Apple Git-113)