usb: typec: tcpm: usb: typec: tcpm: Fix a signedness bug in tcpm_fw_get_caps()

The "port->typec_caps.data" and "port->typec_caps.type" variables are
enums and in this context GCC will treat them as an unsigned int so they
can never be less than zero.

Fixes: ae8a2ca8a221 ("usb: typec: Group all TCPCI/TCPM code together")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20191001120117.GA23528@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 9656274..5f61d99 100644 (file)
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4409,18 +4409,20 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
        /* USB data support is optional */
        ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
        if (ret == 0) {
-               port->typec_caps.data = typec_find_port_data_role(cap_str);
-               if (port->typec_caps.data < 0)
-                       return -EINVAL;
+               ret = typec_find_port_data_role(cap_str);
+               if (ret < 0)
+                       return ret;
+               port->typec_caps.data = ret;
        }
 
        ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
        if (ret < 0)
                return ret;
 
-       port->typec_caps.type = typec_find_port_power_role(cap_str);
-       if (port->typec_caps.type < 0)
-               return -EINVAL;
+       ret = typec_find_port_power_role(cap_str);
+       if (ret < 0)
+               return ret;
+       port->typec_caps.type = ret;
        port->port_type = port->typec_caps.type;
 
        if (port->port_type == TYPEC_PORT_SNK)