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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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17
drivers/serial/sunzilog.c
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@ -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)