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Commit ae14a795 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Greg Kroah-Hartman
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tty: serial: 8250_core: provide a function to export uart_8250_port 



There is no way to access a struct uart_8250_port for a specific
line. This is only required outside of the 8250/uart callbacks like for
devices' suspend & remove callbacks. For those the 8250-core provides a
wrapper like serial8250_unregister_port() which passes the struct
to the proper function based on the line argument.

For run time suspend I need access to this struct not only to make
serial_out() work but also to properly restore up->ier and up->mcr.

Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9d329c1c

drivers/tty/serial/8250/8250.h

+2 −0
Original line number Diff line number Diff line
@@ -112,6 +112,8 @@ static inline void serial_dl_write(struct uart_8250_port *up, int value) 
	up->dl_write(up, value);

}



struct uart_8250_port *serial8250_get_port(int line);



#if defined(__alpha__) && !defined(CONFIG_PCI)

/*

 * Digital did something really horribly wrong with the OUT1 and OUT2

drivers/tty/serial/8250/8250_core.c

+18 −0
Original line number Diff line number Diff line
@@ -2916,6 +2916,24 @@ static struct uart_ops serial8250_pops = { 


static struct uart_8250_port serial8250_ports[UART_NR];



/**

 * serial8250_get_port - retrieve struct uart_8250_port

 * @line: serial line number

 *

 * This function retrieves struct uart_8250_port for the specific line.

 * This struct *must* *not* be used to perform a 8250 or serial core operation

 * which is not accessible otherwise. Its only purpose is to make the struct

 * accessible to the runtime-pm callbacks for context suspend/restore.

 * The lock assumption made here is none because runtime-pm suspend/resume

 * callbacks should not be invoked if there is any operation performed on the

 * port.

 */

struct uart_8250_port *serial8250_get_port(int line)

{

	return &serial8250_ports[line];

}

EXPORT_SYMBOL_GPL(serial8250_get_port);



static void (*serial8250_isa_config)(int port, struct uart_port *up,

	unsigned short *capabilities);