[patch 17/34] appldata_base: Misc cpuinit annotations and bugfix

Martin Schwidefsky
2007-10-04T11:27:23Z

[-- Attachment #1: 017-appldata-cpuinit.diff --]
[-- Type: text/plain, Size: 2090 bytes --]

From: Satyam Sharma <satyam@infradead.org>

appldata_offline_cpu() is only called from __cpuinit-marked hotplug
notifier callback and from the __exit-marked module_exit function,
therefore candidate for __cpuexit.

BTW the __exit module_exit function appldata_exit() of this driver fails to
unregister_hotcpu_notifier() the notifier_block that was registered by
appldata_init() during module startup. This will lead to oops if hotplug
notification comes after module has been unloaded. Let's fix this by
unregistering the notifier appropriately (before appldata_offline_cpu()'ing
the CPUs).

Signed-off-by: Satyam Sharma <satyam@infradead.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

arch/s390/appldata/appldata_base.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

Index: quilt-2.6/arch/s390/appldata/appldata_base.c
===================================================================
--- quilt-2.6.orig/arch/s390/appldata/appldata_base.c
+++ quilt-2.6/arch/s390/appldata/appldata_base.c
@@ -547,8 +547,7 @@ static void __cpuinit appldata_online_cp
spin_unlock(&appldata_timer_lock);
}

-static void
-appldata_offline_cpu(int cpu)
+static void __cpuexit appldata_offline_cpu(int cpu)
{
del_virt_timer(&per_cpu(appldata_timer, cpu));
if (atomic_dec_and_test(&appldata_expire_count)) {
@@ -560,9 +559,9 @@ appldata_offline_cpu(int cpu)
spin_unlock(&appldata_timer_lock);
}

-static int __cpuinit
-appldata_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
+static int __cpuinit appldata_cpu_notify(struct notifier_block *self,
+ unsigned long action,
+ void *hcpu)
{
switch (action) {
case CPU_ONLINE:
@@ -646,6 +645,8 @@ static void __exit appldata_exit(void)
}
spin_unlock(&appldata_ops_lock);

+ unregister_hotcpu_notifier(&appldata_nb);
+
for_each_online_cpu(i)
appldata_offline_cpu(i);