[PATCH][2.6.10-rc2-bk9] 8250 fix for unconfigured FIFO size

[Ian Abbott <abbotti@mev.co.uk>]

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Hi,

In the 8250 driver, for a serial port manually configured by setserial 
(not using autoconfig), the FIFO size and the TX load size do not get 
set.  The attached patch fixes that.  During UART startup, it sanitizes 
the FIFO size and the TX load size.

This might also fix Alexandre Courbot's problem (which I suspect is due 
to the old FIFO size being remembered):

 > Subject: Bug with 2.6 serial driver when in UART 8250 mode
 > Date: Thu, 19 Aug 2004 18:53:49 +0200

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>

[-- Attachment #2: 8250_fifosize.patch --]
[-- Type: text/x-patch, Size: 775 bytes --]

diff -urN linux-2.6.10-rc2-bk9/drivers/serial/8250.c linux-2.6.10-rc2-bk9-ia/drivers/serial/8250.c
--- linux-2.6.10-rc2-bk9/drivers/serial/8250.c	2004-11-26 17:26:45.571917552 +0000
+++ linux-2.6.10-rc2-bk9-ia/drivers/serial/8250.c	2004-11-26 19:59:50.614578824 +0000
@@ -1359,6 +1359,14 @@
 	up->capabilities = uart_config[up->port.type].flags;
 	up->mcr = 0;
 
+	if (up->port.fifosize <= 0 ||
+	    up->port.fifosize > uart_config[up->port.type].fifo_size)
+		up->port.fifosize = uart_config[up->port.type].fifo_size;
+	if (up->tx_loadsz == 0)
+		up->tx_loadsz = uart_config[up->port.type].tx_loadsz;
+	if (up->tx_loadsz > up->port.fifosize)
+		up->tx_loadsz = up->port.fifosize;
+
 	if (up->port.type == PORT_16C950) {
 		/* Wake up and initialize UART */
 		up->acr = 0;