Re: [OOPS] paport related OOPS since 2.6.11-bk7

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Mon, Mar 28, 2005 at 06:45:43PM +0200, Eran Mann wrote:
> The OOPS below gets generated consistently when FC3 kudzu is run during 
> boot (tested between 2.6.11-bk7 and 2.6.11.6-bk1). It seems to be caused 
> by the hotplug-parport changeset:
> http://linux.bkbits.net:8080/linux-2.5/cset@4230791b6YtcIhZDSvvWbzSdUpg2zg?nav=index.html|ChangeSet@-4w
> (reverting this changeset eliminates the oops).

Please try this instead.

It appears that the parport driver claims on-board superio devices
without actually doing anything.  When the driver is removed, we
try to dereference non-existent driver data to unregister the ports.
Since we didn't register anything, it's safe to ignore these devices
in the remove function.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>

diff -up -x BitKeeper -x ChangeSet -x SCCS -x _xlk -x *.orig -x *.rej orig/drivers/parport/parport_pc.c linux/drivers/parport/parport_pc.c
--- orig/drivers/parport/parport_pc.c	Sat Mar 19 11:22:08 2005
+++ linux/drivers/parport/parport_pc.c	Mon Mar 28 17:55:51 2005
@@ -2976,10 +2976,12 @@ static void __devexit parport_pc_pci_rem
 
 	pci_set_drvdata(dev, NULL);
 
-	for (i = data->num - 1; i >= 0; i--)
-		parport_pc_unregister_port(data->ports[i]);
+	if (data) {
+		for (i = data->num - 1; i >= 0; i--)
+			parport_pc_unregister_port(data->ports[i]);
 
-	kfree(data);
+		kfree(data);
+	}
 }
 
 static struct pci_driver parport_pc_pci_driver = {

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core