Move xen patchset to new version's subdir.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.arch / s390-08-03-iucv-cpu-hotremove.diff

diff --git a/src/patches/suse-2.6.27.31/patches.arch/s390-08-03-iucv-cpu-hotremove.diff b/src/patches/suse-2.6.27.31/patches.arch/s390-08-03-iucv-cpu-hotremove.diff
new file mode 100644 (file)
index 0000000..98cbf4b
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.arch/s390-08-03-iucv-cpu-hotremove.diff
@@ -0,0 +1,83 @@
+From: Gerald Schaefer <geraldsc@de.ibm.com>
+Subject: iucv: failing cpu hot remove for inactive iucv
+References: bnc#466462,LTC#51104
+
+Symptom:     cpu hot remove rejected with NOTIFY_BAD
+Problem:     If the iucv module is compiled in / loaded but no user
+             is registered, cpu hot remove doesn't work. The iucv
+             cpu hotplug notifier on CPU_DOWN_PREPARE checks, if
+             the iucv_buffer_cpumask would be empty after the
+             corresponding bit would be cleared. However the bit
+             was never set since iucv wasn't enabled. That causes
+             all cpu hot unplug operations to fail in this scenario.
+Solution:    Use iucv_path_table as an indicator whether iucv is
+             enabled or not.
+
+Acked-by: John Jolly <jjolly@suse.de>
+---
+
+ net/iucv/iucv.c |   18 +++++++++++-------
+ 1 file changed, 11 insertions(+), 7 deletions(-)
+
+Index: linux-sles11/net/iucv/iucv.c
+===================================================================
+--- linux-sles11.orig/net/iucv/iucv.c
++++ linux-sles11/net/iucv/iucv.c
+@@ -516,6 +516,7 @@ static int iucv_enable(void)
+       size_t alloc_size;
+       int cpu, rc;
+ 
++      get_online_cpus();
+       rc = -ENOMEM;
+       alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
+       iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
+@@ -523,19 +524,17 @@ static int iucv_enable(void)
+               goto out;
+       /* Declare per cpu buffers. */
+       rc = -EIO;
+-      get_online_cpus();
+       for_each_online_cpu(cpu)
+               smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
+       if (cpus_empty(iucv_buffer_cpumask))
+               /* No cpu could declare an iucv buffer. */
+-              goto out_path;
++              goto out;
+       put_online_cpus();
+       return 0;
+-
+-out_path:
+-      put_online_cpus();
+-      kfree(iucv_path_table);
+ out:
++      kfree(iucv_path_table);
++      iucv_path_table = NULL;
++      put_online_cpus();
+       return rc;
+ }
+ 
+@@ -550,8 +549,9 @@ static void iucv_disable(void)
+ {
+       get_online_cpus();
+       on_each_cpu(iucv_retrieve_cpu, NULL, 1);
+-      put_online_cpus();
+       kfree(iucv_path_table);
++      iucv_path_table = NULL;
++      put_online_cpus();
+ }
+ 
+ static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
+@@ -588,10 +588,14 @@ static int __cpuinit iucv_cpu_notify(str
+       case CPU_ONLINE_FROZEN:
+       case CPU_DOWN_FAILED:
+       case CPU_DOWN_FAILED_FROZEN:
++              if (!iucv_path_table)
++                      break;
+               smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
+               break;
+       case CPU_DOWN_PREPARE:
+       case CPU_DOWN_PREPARE_FROZEN:
++              if (!iucv_path_table)
++                      break;
+               cpumask = iucv_buffer_cpumask;
+               cpu_clear(cpu, cpumask);
+               if (cpus_empty(cpumask))