tty: use const parameters in port-flag accessors

Declare the port parameter to the flag-test accessors as const.

This is currently mostly cosmetic as the accessors are already inlined.
Suggested-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20201202113942.27024-3-johan@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/tty.h

@@ -608,7 +608,7 @@ static inline struct tty_port *tty_port_get(struct tty_port *port)
 }
 
 /* If the cts flow control is enabled, return true. */
-static inline bool tty_port_cts_enabled(struct tty_port *port)
+static inline bool tty_port_cts_enabled(const struct tty_port *port)
 {
 	return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
 }
@@ -618,7 +618,7 @@ static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
 	assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val);
 }
 
-static inline bool tty_port_active(struct tty_port *port)
+static inline bool tty_port_active(const struct tty_port *port)
 {
 	return test_bit(TTY_PORT_ACTIVE, &port->iflags);
 }
@@ -628,7 +628,7 @@ static inline void tty_port_set_active(struct tty_port *port, bool val)
 	assign_bit(TTY_PORT_ACTIVE, &port->iflags, val);
 }
 
-static inline bool tty_port_check_carrier(struct tty_port *port)
+static inline bool tty_port_check_carrier(const struct tty_port *port)
 {
 	return test_bit(TTY_PORT_CHECK_CD, &port->iflags);
 }
@@ -638,7 +638,7 @@ static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
 	assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val);
 }
 
-static inline bool tty_port_suspended(struct tty_port *port)
+static inline bool tty_port_suspended(const struct tty_port *port)
 {
 	return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
 }
@@ -648,7 +648,7 @@ static inline void tty_port_set_suspended(struct tty_port *port, bool val)
 	assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val);
 }
 
-static inline bool tty_port_initialized(struct tty_port *port)
+static inline bool tty_port_initialized(const struct tty_port *port)
 {
 	return test_bit(TTY_PORT_INITIALIZED, &port->iflags);
 }
@@ -658,7 +658,7 @@ static inline void tty_port_set_initialized(struct tty_port *port, bool val)
 	assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val);
 }
 
-static inline bool tty_port_kopened(struct tty_port *port)
+static inline bool tty_port_kopened(const struct tty_port *port)
 {
 	return test_bit(TTY_PORT_KOPENED, &port->iflags);
 }