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serial: 8250: introduce RPM guard()s

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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: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250814072456.182853-5-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE)
2025-08-14 09:24:44 +02:00
committed by Greg Kroah-Hartman
parent 0fd60b689b
commit 9f8da7b2f9
2 changed files with 9 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/tty/serial/8250/8250.h
View File

@@ -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);

6
drivers/tty/serial/8250/8250_port.c
View File

@@ -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