Merge mainline v2.6.27-rc2 tree into linux-omap tree

[linux-2.6-omap-h63xx.git] / drivers / serial / 8250.c

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 9b913db147a591fcadab8ba6a7e7be85e8c8ef1c..5a5f95f7752301f39dc7057e035cd403f64d3ad8 100644 (file)
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -12,8 +12,6 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
- *  $Id: 8250.c,v 1.90 2002/07/28 10:03:27 rmk Exp $
- *
  * A note about mapbase / membase
  *
  *  mapbase is the physical address of the IO port.
@@ -1289,13 +1287,24 @@ static void serial8250_enable_ms(struct uart_port *port)
 static void
 receive_chars(struct uart_8250_port *up, unsigned int *status)
 {
-       struct tty_struct *tty = up->port.info->tty;
+       struct tty_struct *tty = up->port.info->port.tty;
        unsigned char ch, lsr = *status;
        int max_count = 256;
        char flag;
 
        do {
-               ch = serial_inp(up, UART_RX);
+               if (likely(lsr & UART_LSR_DR))
+                       ch = serial_inp(up, UART_RX);
+               else
+                       /*
+                        * Intel 82571 has a Serial Over Lan device that will
+                        * set UART_LSR_BI without setting UART_LSR_DR when
+                        * it receives a break. To avoid reading from the
+                        * receive buffer without UART_LSR_DR bit set, we
+                        * just force the read character to be 0
+                        */
+                       ch = 0;
+
                flag = TTY_NORMAL;
                up->port.icount.rx++;
 
@@ -1344,7 +1353,7 @@ receive_chars(struct uart_8250_port *up, unsigned int *status)
 
 ignore_char:
                lsr = serial_inp(up, UART_LSR);
-       } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
+       } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
        spin_unlock(&up->port.lock);
        tty_flip_buffer_push(tty);
        spin_lock(&up->port.lock);
@@ -1427,7 +1436,7 @@ serial8250_handle_port(struct uart_8250_port *up)
 
        DEBUG_INTR("status = %x...", status);
 
-       if (status & UART_LSR_DR)
+       if (status & (UART_LSR_DR | UART_LSR_BI))
                receive_chars(up, &status);
        check_modem_status(up);
        if (status & UART_LSR_THRE)
@@ -1881,6 +1890,8 @@ static int serial8250_startup(struct uart_port *port)
                 * allow register changes to become visible.
                 */
                spin_lock_irqsave(&up->port.lock, flags);
+               if (up->port.flags & UPF_SHARE_IRQ)
+                       disable_irq_nosync(up->port.irq);
 
                wait_for_xmitr(up, UART_LSR_THRE);
                serial_out_sync(up, UART_IER, UART_IER_THRI);
@@ -1892,6 +1903,8 @@ static int serial8250_startup(struct uart_port *port)
                iir = serial_in(up, UART_IIR);
                serial_out(up, UART_IER, 0);
 
+               if (up->port.flags & UPF_SHARE_IRQ)
+                       enable_irq(up->port.irq);
                spin_unlock_irqrestore(&up->port.lock, flags);
 
                /*
@@ -2956,7 +2969,7 @@ static int __init serial8250_init(void)
        if (nr_uarts > UART_NR)
                nr_uarts = UART_NR;
 
-       printk(KERN_INFO "Serial: 8250/16550 driver $Revision: 1.90 $ "
+       printk(KERN_INFO "Serial: 8250/16550 driver"
                "%d ports, IRQ sharing %sabled\n", nr_uarts,
                share_irqs ? "en" : "dis");
 
@@ -3017,7 +3030,7 @@ EXPORT_SYMBOL(serial8250_suspend_port);
 EXPORT_SYMBOL(serial8250_resume_port);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Generic 8250/16x50 serial driver $Revision: 1.90 $");
+MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
 
 module_param(share_irqs, uint, 0644);
 MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices"