linux-kernel - [PATCH -next] usb: typec: mux: Fix unsigned comparison with less than zero

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Message-ID: <20190219065750.9004-1-yuehaibing@huawei.com>
Date:   Tue, 19 Feb 2019 14:57:50 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <heikki.krogerus@...ux.intel.com>, <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] usb: typec: mux: Fix unsigned comparison with less than zero

The return from the call to fwnode_property_read_u16_array is int, 
it can be a negative error code however this is being assigned to
an size_t variable 'nval', hence the check is always false.
Fix this by making 'nval' an int.

Detected by Coccinelle ("Unsigned expression compared with
zero: nval < 0")

Fixes: 96a6d031ca99 ("usb: typec: mux: Find the muxes by also matching against the device node")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/usb/typec/mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
index a5947d9..54d7497 100644
--- a/drivers/usb/typec/mux.c
+++ b/drivers/usb/typec/mux.c
@@ -126,7 +126,7 @@ static void *typec_mux_match(struct device_connection *con, int ep, void *data)
 {
 	const struct typec_altmode_desc *desc = data;
 	struct typec_mux *mux;
-	size_t nval;
+	int nval;
 	bool match;
 	u16 *val;
 	int i;
-- 
2.7.0