diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2007-07-15 23:53:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-16 04:05:28 -0700 |
| commit | f3c681c028846bd5d39f563909409832a295ca69 (patch) | |
| tree | ff492b31f535a76f1d8ad82b916bb6293f550123 /drivers/serial/sunzilog.c | |
| parent | 9918cc2e3275bf7f3561e4de1d5a3314183e71dc (diff) | |
[SERIAL]: Fix console write locking in sparc drivers.
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>
Diffstat (limited to 'drivers/serial/sunzilog.c')
| -rw-r--r-- | drivers/serial/sunzilog.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c index 15b6e1cb040b..0a3e10a4a35d 100644 --- a/drivers/serial/sunzilog.c +++ b/drivers/serial/sunzilog.c @@ -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) |