Fix console write locking in sparc drivers.

[karo-tx-linux.git] / drivers / serial / sunhv.c

diff --git a/drivers/serial/sunhv.c b/drivers/serial/sunhv.c
index 96557e6dba60c4d57a1d96842ba5aa6cd3e8902b..17bcca53d6a1a70fb5efc374c876160961facb91 100644 (file)
--- 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 = {