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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/sunhv.c
parent9918cc2e3275bf7f3561e4de1d5a3314183e71dc (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/sunhv.c')
-rw-r--r--drivers/serial/sunhv.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/serial/sunhv.c b/drivers/serial/sunhv.c
index 96557e6dba60..17bcca53d6a1 100644
--- a/drivers/serial/sunhv.c
+++ b/drivers/serial/sunhv.c
@@ -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 = {