Merge current mainline 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 4de99ffa0b7d2b7d822e23067feeed51383d37b5..67877b1be0dd818e08b634d3d3c1d715603889c5 100644 (file)
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2087,6 +2087,20 @@ static int serial8250_startup(struct uart_port *port)
 
        serial8250_set_mctrl(&up->port, up->port.mctrl);
 
+       /* Serial over Lan (SoL) hack:
+          Intel 8257x Gigabit ethernet chips have a
+          16550 emulation, to be used for Serial Over Lan.
+          Those chips take a longer time than a normal
+          serial device to signalize that a transmission
+          data was queued. Due to that, the above test generally
+          fails. One solution would be to delay the reading of
+          iir. However, this is not reliable, since the timeout
+          is variable. So, let's just don't test if we receive
+          TX irq. This way, we'll never enable UART_BUG_TXEN.
+        */
+       if (up->port.flags & UPF_NO_TXEN_TEST)
+               goto dont_test_tx_en;
+
        /*
         * Do a quick test to see if we receive an
         * interrupt when we enable the TX irq.
@@ -2106,6 +2120,7 @@ static int serial8250_startup(struct uart_port *port)
                up->bugs &= ~UART_BUG_TXEN;
        }
 
+dont_test_tx_en:
        spin_unlock_irqrestore(&up->port.lock, flags);
 
        /*