aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/appldata
diff options
context:
space:
mode:
authorGerald Schaefer <gerald.schaefer@de.ibm.com>2008-05-30 10:03:28 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-05-30 10:03:34 +0200
commit1760537b69123905bf4f4b56f5746ae4547e9694 (patch)
tree9f44fb7c348d9597c2e9e4acb8ee13ac65f37756 /arch/s390/appldata
parent67060d9c1f5d91c917cc51bed464cb5638eaddbc (diff)
downloadlinux-linaro-android-1760537b69123905bf4f4b56f5746ae4547e9694.tar.gz
[S390] appldata: prevent cpu hotplug when walking cpu_online_map.
Use get_online_cpus() to prevent cpu hotplug in situations where for_each_online_cpu() is called. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/appldata')
-rw-r--r--arch/s390/appldata/appldata_base.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index 655d52543e2..ad40729bec3 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -130,6 +130,7 @@ static void appldata_work_fn(struct work_struct *work)
P_DEBUG(" -= Work Queue =-\n");
i = 0;
+ get_online_cpus();
spin_lock(&appldata_ops_lock);
list_for_each(lh, &appldata_ops_list) {
ops = list_entry(lh, struct appldata_ops, list);
@@ -140,6 +141,7 @@ static void appldata_work_fn(struct work_struct *work)
}
}
spin_unlock(&appldata_ops_lock);
+ put_online_cpus();
}
/*
@@ -266,12 +268,14 @@ appldata_timer_handler(ctl_table *ctl, int write, struct file *filp,
len = *lenp;
if (copy_from_user(buf, buffer, len > sizeof(buf) ? sizeof(buf) : len))
return -EFAULT;
+ get_online_cpus();
spin_lock(&appldata_timer_lock);
if (buf[0] == '1')
__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
else if (buf[0] == '0')
__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
spin_unlock(&appldata_timer_lock);
+ put_online_cpus();
out:
*lenp = len;
*ppos += len;
@@ -314,10 +318,12 @@ appldata_interval_handler(ctl_table *ctl, int write, struct file *filp,
return -EINVAL;
}
+ get_online_cpus();
spin_lock(&appldata_timer_lock);
appldata_interval = interval;
__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
spin_unlock(&appldata_timer_lock);
+ put_online_cpus();
P_INFO("Monitoring CPU interval set to %u milliseconds.\n",
interval);
@@ -556,8 +562,10 @@ static int __init appldata_init(void)
return -ENOMEM;
}
+ get_online_cpus();
for_each_online_cpu(i)
appldata_online_cpu(i);
+ put_online_cpus();
/* Register cpu hotplug notifier */
register_hotcpu_notifier(&appldata_nb);