linux-kernel - [PATCH][next] media: i2c: fix error check on max9286

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Message-Id: <20200720161335.339174-1-colin.king@canonical.com>
Date:   Mon, 20 Jul 2020 17:13:35 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] media: i2c: fix error check on max9286_read call

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

Currently the error return from the call to max9286_read is masked
with 0xf0 so the following check for a negative error return is
never true.  Fix this by checking for an error first, then masking
the return value for subsequent conflink_mask checking.

Addresses-Coverity: ("Logically dead code")
fixes: 66d8c9d2422d ("media: i2c: Add MAX9286 driver")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/i2c/max9286.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 47f280518fdb..b364a3f60486 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -405,10 +405,11 @@ static int max9286_check_config_link(struct max9286_priv *priv,
 	 * to 5 milliseconds.
 	 */
 	for (i = 0; i < 10; i++) {
-		ret = max9286_read(priv, 0x49) & 0xf0;
+		ret = max9286_read(priv, 0x49);
 		if (ret < 0)
 			return -EIO;
 
+		ret &= 0xf0;
 		if (ret == conflink_mask)
 			break;
 
-- 
2.27.0