[PATCH] patches: workaround for br_del_if race

[Ryan Harper <ryanh@us.ibm.com>]

This patch provides a workaround for bugzilla #90 which shows up far too
often when creating and then destroying lots of domUs and dom0 is SMP.
Details are in the [1]bug.  With this patch, I now can create/destroy
domains in a tight loop for hours where previously every 3 to 10 cycles
would blow up.

Please apply.

1. http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=90

-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@us.ibm.com


diffstat output:
 workaround_double_br_del_if.patch |   11 +++++++++++
 1 files changed, 11 insertions(+)

Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
---
diff -r dfbeb7da829f patches/linux-2.6.12/workaround_double_br_del_if.patch
--- /dev/null	Thu Aug 18 19:51:46 2005
+++ b/patches/linux-2.6.12/workaround_double_br_del_if.patch	Thu Aug 18 15:53:37 2005
@@ -0,0 +1,11 @@
+--- linux-2.6.12/net/bridge/br_if.c	2005-06-17 14:48:29.000000000 -0500
++++ linux-2.6.12-xen0-smp/net/bridge/br_if.c	2005-08-18 15:17:27.302615846 -0500
+@@ -382,7 +382,7 @@
+ {
+ 	struct net_bridge_port *p = dev->br_port;
+ 	
+-	if (!p || p->br != br) 
++	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
+ 		return -EINVAL;
+ 
+ 	br_sysfs_removeif(p);