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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2008-05-30 10:03:28 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-05-30 10:03:34 +0200 |
| commit | 1760537b69123905bf4f4b56f5746ae4547e9694 (patch) | |
| tree | 9f44fb7c348d9597c2e9e4acb8ee13ac65f37756 /arch/s390/appldata | |
| parent | 67060d9c1f5d91c917cc51bed464cb5638eaddbc (diff) | |
| download | linux-1760537b69123905bf4f4b56f5746ae4547e9694.tar.gz linux-1760537b69123905bf4f4b56f5746ae4547e9694.tar.bz2 linux-1760537b69123905bf4f4b56f5746ae4547e9694.zip | |
[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.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c index 655d52543e2d..ad40729bec3d 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); |