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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 10:53:32 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 15:05:28 +0400
commitf3c681c028846bd5d39f563909409832a295ca69 (patch)
treeff492b31f535a76f1d8ad82b916bb6293f550123 /drivers/serial/sunzilog.c
parent9918cc2e3275bf7f3561e4de1d5a3314183e71dc (diff)
downloadlinux-f3c681c028846bd5d39f563909409832a295ca69.tar.xz
[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.c17
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)