linux-kernel - [PATCH v2 1/1] usb: typec: stusb160x: fix signedness comparison issue with enum variables

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Date:   Wed, 28 Oct 2020 17:33:09 +0100
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Fabrice Gasnier <fabrice.gasnier@...com>
Subject: [PATCH v2 1/1] usb: typec: stusb160x: fix signedness comparison issue with enum variables

chip->port_type and chip->pwr_opmode are enums and when GCC considers them
as unsigned, the conditions are never met.
This patch takes advantage of the ret variable and fixes the following
warnings:
drivers/usb/typec/stusb160x.c:548 stusb160x_get_fw_caps() warn: unsigned 'chip->port_type' is never less than zero.
drivers/usb/typec/stusb160x.c:570 stusb160x_get_fw_caps() warn: unsigned 'chip->pwr_opmode' is never less than zero.

Fixes: da0cb6310094 ("usb: typec: add support for STUSB160x Type-C controller family")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
v2: Remove blank line
---
 drivers/usb/typec/stusb160x.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/typec/stusb160x.c b/drivers/usb/typec/stusb160x.c
index da7f1957bcb3..2c6636e8535d 100644
--- a/drivers/usb/typec/stusb160x.c
+++ b/drivers/usb/typec/stusb160x.c
@@ -544,11 +544,10 @@ static int stusb160x_get_fw_caps(struct stusb160x *chip,
 	 */
 	ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
 	if (!ret) {
-		chip->port_type = typec_find_port_power_role(cap_str);
-		if ((int)chip->port_type < 0) {
-			ret = chip->port_type;
+		ret = typec_find_port_power_role(cap_str);
+		if (ret < 0)
 			return ret;
-		}
+		chip->port_type = ret;
 	}
 	chip->capability.type = chip->port_type;
 
@@ -565,16 +564,13 @@ static int stusb160x_get_fw_caps(struct stusb160x *chip,
 	 */
 	ret = fwnode_property_read_string(fwnode, "power-opmode", &cap_str);
 	if (!ret) {
-		chip->pwr_opmode = typec_find_pwr_opmode(cap_str);
+		ret = typec_find_pwr_opmode(cap_str);
 		/* Power delivery not yet supported */
-		if ((int)chip->pwr_opmode < 0 ||
-		    chip->pwr_opmode == TYPEC_PWR_MODE_PD) {
-			ret = (int)chip->pwr_opmode < 0 ? chip->pwr_opmode :
-							  -EINVAL;
-			dev_err(chip->dev, "bad power operation mode: %d\n",
-				chip->pwr_opmode);
-			return ret;
+		if (ret < 0 || ret == TYPEC_PWR_MODE_PD) {
+			dev_err(chip->dev, "bad power operation mode: %d\n", ret);
+			return -EINVAL;
 		}
+		chip->pwr_opmode = ret;
 	}
 
 	return 0;
-- 
2.17.1