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serial: 8250: Document serial8250_modem_status() locking

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Existing callers of serial8250_modem_status() [1] hold the uart port
lock; document.

[1] In-tree callers of serial8250_modem_status()

drivers/tty/serial/8250/8250_fsl.c
  fsl8250_handle_irq()

drivers/tty/serial/8250/8250_core.c
  serial8250_handle_irq()
  serial8250_console_write()
  serial8250_get_mctrl() *

* Call graphs for callers of serial8250_get_mctrl() from the function
  which acquires the uart port lock

drivers/tty/serial/serial_core.c
  uart_port_startup()
  uart_tiocmget()
  uart_set_termios()
  uart_carrier_raised()
    ops->get_mctrl() ---> serial8250_get_mctrl()

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-09-02 17:39:20 -04:00 committed by Greg Kroah-Hartman
parent 8a949b07e4
commit 5435d20f50
1 changed files with 1 additions and 0 deletions
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1
drivers/tty/serial/8250/8250_core.c
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@ -1463,6 +1463,7 @@ void serial8250_tx_chars(struct uart_8250_port *up)
}
EXPORT_SYMBOL_GPL(serial8250_tx_chars);
/* Caller holds uart port lock */
unsigned int serial8250_modem_status(struct uart_8250_port *up)
{
struct uart_port *port = &up->port;