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[SERIAL]: Fix console write locking in sparc drivers.

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Mirror the logic in 8250 for proper console write locking
when SYSRQ is triggered or an OOPS is in progress.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-07-15 23:53:32 -07:00
parent 9918cc2e32
commit f3c681c028
4 changed files with 68 additions and 12 deletions
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30
drivers/serial/sunhv.c
View file

@ -440,8 +440,16 @@ static void sunhv_console_write_paged(struct console *con, const char *s, unsign
{
struct uart_port *port = sunhv_port;
unsigned long flags;
int locked = 1;
local_irq_save(flags);
if (port->sysrq) {
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&port->lock);
} else
spin_lock(&port->lock);
spin_lock_irqsave(&port->lock, flags);
while (n > 0) {
unsigned long ra = __pa(con_write_page);
unsigned long page_bytes;
@ -469,7 +477,10 @@ static void sunhv_console_write_paged(struct console *con, const char *s, unsign
ra += written;
}
}
spin_unlock_irqrestore(&port->lock, flags);
if (locked)
spin_unlock(&port->lock);
local_irq_restore(flags);
}
static inline void sunhv_console_putchar(struct uart_port *port, char c)
@ -488,7 +499,15 @@ static void sunhv_console_write_bychar(struct console *con, const char *s, unsig
{
struct uart_port *port = sunhv_port;
unsigned long flags;
int i;
int i, locked = 1;
local_irq_save(flags);
if (port->sysrq) {
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&port->lock);
} else
spin_lock(&port->lock);
spin_lock_irqsave(&port->lock, flags);
for (i = 0; i < n; i++) {
@ -496,7 +515,10 @@ static void sunhv_console_write_bychar(struct console *con, const char *s, unsig
sunhv_console_putchar(port, '\r');
sunhv_console_putchar(port, *s++);
}
spin_unlock_irqrestore(&port->lock, flags);
if (locked)
spin_unlock(&port->lock);
local_irq_restore(flags);
}
static struct console sunhv_console = {

19
drivers/serial/sunsab.c
View file

@ -860,22 +860,31 @@ static int num_channels;
static void sunsab_console_putchar(struct uart_port *port, int c)
{
struct uart_sunsab_port *up = (struct uart_sunsab_port *)port;
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
sunsab_tec_wait(up);
writeb(c, &up->regs->w.tic);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static void sunsab_console_write(struct console *con, const char *s, unsigned n)
{
struct uart_sunsab_port *up = &sunsab_ports[con->index];
unsigned long flags;
int locked = 1;
local_irq_save(flags);
if (up->port.sysrq) {
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&up->port.lock);
} else
spin_lock(&up->port.lock);
uart_console_write(&up->port, s, n, sunsab_console_putchar);
sunsab_tec_wait(up);
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
}
static int sunsab_console_setup(struct console *con, char *options)

14
drivers/serial/sunsu.c
View file

@ -1288,7 +1288,17 @@ static void sunsu_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_sunsu_port *up = &sunsu_ports[co->index];
unsigned long flags;
unsigned int ier;
int locked = 1;
local_irq_save(flags);
if (up->port.sysrq) {
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&up->port.lock);
} else
spin_lock(&up->port.lock);
/*
* First save the UER then disable the interrupts
@ -1304,6 +1314,10 @@ static void sunsu_console_write(struct console *co, const char *s,
*/
wait_for_xmitr(up);
serial_out(up, UART_IER, ier);
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
}
/*

17
drivers/serial/sunzilog.c
View file

@ -9,7 +9,7 @@
* C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
* work there.
*
* Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net)
* Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/module.h>
@ -1151,11 +1151,22 @@ sunzilog_console_write(struct console *con, const char *s, unsigned int count)
{
struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
unsigned long flags;
int locked = 1;
local_irq_save(flags);
if (up->port.sysrq) {
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&up->port.lock);
} else
spin_lock(&up->port.lock);
spin_lock_irqsave(&up->port.lock, flags);
uart_console_write(&up->port, s, count, sunzilog_putchar);
udelay(2);
spin_unlock_irqrestore(&up->port.lock, flags);
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
}
static int __init sunzilog_console_setup(struct console *con, char *options)