linux-kernel - [PATCH] fix early_serial

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Date:	Tue, 13 Jan 2009 22:51:07 +0100
From:	Helge Deller <deller@....de>
To:	David Daney <ddaney@...iumnetworks.com>,
	Tomaso Paoletti <tpaoletti@...iumnetworks.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kyle McMartin <kyle@...artin.ca>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org, "Rafael J. Wysocky" <rjw@...k.pl>
CC:	linux-parisc@...r.kernel.org
Subject: [PATCH] fix early_serial_setup() regression

commit b430428a188e8a434325e251d0704af4b88b4711,
	"8250: Don't clobber spinlocks."
introduced a regression on the parisc architecture, which
broke the handover to the serial port at boottime.

early_serial_setup() was changed to only copy a subset of the
uart_port fields, and sadly the "type" and "line" fields
were forgotten and thus the serial port was not initialized
and could not be used for a handover.
This patch fixes this by copying the missing fields.

As this change to early_serial_setup() doesn't need an 
initialized spinlock in the uart_port struct any longer, we
can drop the spinlock initialization in the superio driver.

CC: David Daney <ddaney@...iumnetworks.com>
CC: Tomaso Paoletti <tpaoletti@...iumnetworks.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Alan Cox <alan@...rguk.ukuu.org.uk>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Kyle McMartin <kyle@...artin.ca>
CC: linux-parisc@...r.kernel.org

Signed-off-by: Helge Deller <deller@....de>


diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 1889a63..0d934bf 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2839,6 +2839,8 @@ int __init early_serial_setup(struct uart_port *port)
 	p->flags        = port->flags;
 	p->mapbase      = port->mapbase;
 	p->private_data = port->private_data;
+	p->type		= port->type;
+	p->line		= port->line;
 
 	set_io_from_upio(p);
 	if (port->serial_in)
diff --git a/drivers/parisc/superio.c b/drivers/parisc/superio.c
index 1e93c83..4fa3bb2 100644
--- a/drivers/parisc/superio.c
+++ b/drivers/parisc/superio.c
@@ -405,7 +405,6 @@ static void __init superio_serial_init(void)
 	serial_port.type	= PORT_16550A;
 	serial_port.uartclk	= 115200*16;
 	serial_port.fifosize	= 16;
-	spin_lock_init(&serial_port.lock);
 
 	/* serial port #1 */
 	serial_port.iobase	= sio_dev.sp1_base;

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