linux-kernel - [PATCH 4.18 014/150] drm/i2c: tda9950: fix timeout counter check

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Message-Id: <20181102182903.738283675@linuxfoundation.org>
Date:   Fri,  2 Nov 2018 19:32:56 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.18 014/150] drm/i2c: tda9950: fix timeout counter check

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit d98627d1360d55e3b28f702caca8b6342c4a4e45 ]

Currently the check to see if the timeout has reached zero is incorrect
and the check is instead checking if the timeout is non-zero and not
zero, hence it will break out of the loop on the first iteration and
the msleep is never executed.  Fix this by breaking from the loop when
timeout is zero.

Detected by CoverityScan, CID#1469404 ("Logically Dead Code")

Fixes: f0316f93897c ("drm/i2c: tda9950: add CEC driver")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/i2c/tda9950.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i2c/tda9950.c b/drivers/gpu/drm/i2c/tda9950.c
index 3f7396caad48..f2186409f0cf 100644
--- a/drivers/gpu/drm/i2c/tda9950.c
+++ b/drivers/gpu/drm/i2c/tda9950.c
@@ -307,7 +307,7 @@ static void tda9950_release(struct tda9950_priv *priv)
 	/* Wait up to .5s for it to signal non-busy */
 	do {
 		csr = tda9950_read(client, REG_CSR);
-		if (!(csr & CSR_BUSY) || --timeout)
+		if (!(csr & CSR_BUSY) || !--timeout)
 			break;
 		msleep(10);
 	} while (1);
-- 
2.17.1