Commit 9f8da7b2 authored by Jiri Slaby (SUSE)'s avatar Jiri Slaby (SUSE) Committed by Greg Kroah-Hartman
Browse files

serial: 8250: introduce RPM guard()s 



Having this, guards like these work:
  guard(serial8250_rpm)(up);
or
  scoped_guard(serial8250_rpm, up) {
    ...
  }

See e.g. "serial: 8250: use guard()s" later in this series.

And make them available to anyone (EXPORT + put in 8250.h) as drivers
open code this anyway.

The _tx ones are not defined as they would have no user.

Signed-off-by: default avatar"Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250814072456.182853-5-jirislaby@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0fd60b68

drivers/tty/serial/8250/8250.h

+5 −0
Original line number Diff line number Diff line
@@ -186,6 +186,11 @@ static unsigned int __maybe_unused serial_icr_read(struct uart_8250_port *up, 


void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);



void serial8250_rpm_get(struct uart_8250_port *p);

void serial8250_rpm_put(struct uart_8250_port *p);

DEFINE_GUARD(serial8250_rpm, struct uart_8250_port *,

	     serial8250_rpm_get(_T), serial8250_rpm_put(_T));



static inline u32 serial_dl_read(struct uart_8250_port *up)

{

	return up->dl_read(up);

drivers/tty/serial/8250/8250_port.c

+4 −2
Original line number Diff line number Diff line
@@ -508,20 +508,22 @@ void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) 
}

EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos);



static void serial8250_rpm_get(struct uart_8250_port *p)

void serial8250_rpm_get(struct uart_8250_port *p)

{

	if (!(p->capabilities & UART_CAP_RPM))

		return;

	pm_runtime_get_sync(p->port.dev);

}

EXPORT_SYMBOL_GPL(serial8250_rpm_get);



static void serial8250_rpm_put(struct uart_8250_port *p)

void serial8250_rpm_put(struct uart_8250_port *p)

{

	if (!(p->capabilities & UART_CAP_RPM))

		return;

	pm_runtime_mark_last_busy(p->port.dev);

	pm_runtime_put_autosuspend(p->port.dev);

}

EXPORT_SYMBOL_GPL(serial8250_rpm_put);



/**

 *	serial8250_em485_init() - put uart_8250_port into rs485 emulating