TTY: pmac_zilog, check existence of ports in pmz_console_init()

[pandora-kernel.git] / drivers / tty / serial / pmac_zilog.c

diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 5acd24a..a6caf62 100644 (file)
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1407,10 +1407,16 @@ static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
 static int pmz_poll_get_char(struct uart_port *port)
 {
        struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
+       int tries = 2;
 
-       while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0)
-               udelay(5);
-       return read_zsdata(uap);
+       while (tries) {
+               if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
+                       return read_zsdata(uap);
+               if (tries--)
+                       udelay(5);
+       }
+
+       return NO_POLL_CHAR;
 }
 
 static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
@@ -2192,6 +2198,9 @@ static int __init pmz_console_init(void)
        /* Probe ports */
        pmz_probe();
 
+       if (pmz_ports_count == 0)
+               return -ENODEV;
+
        /* TODO: Autoprobe console based on OF */
        /* pmz_console.index = i; */
        register_console(&pmz_console);