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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-15 23:53:32 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 04:05:28 -0700
commitf3c681c028846bd5d39f563909409832a295ca69 (patch)
treeff492b31f535a76f1d8ad82b916bb6293f550123 /drivers/serial/sunsab.c
parent9918cc2e3275bf7f3561e4de1d5a3314183e71dc (diff)
downloadop-kernel-dev-f3c681c028846bd5d39f563909409832a295ca69.zip
op-kernel-dev-f3c681c028846bd5d39f563909409832a295ca69.tar.gz
[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/sunsab.c')
-rw-r--r--drivers/serial/sunsab.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/serial/sunsab.c b/drivers/serial/sunsab.c
index deb9ab4..8a0f9e4 100644
--- a/drivers/serial/sunsab.c
+++ b/drivers/serial/sunsab.c
@@ -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)
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