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path: root/drivers/s390/char/sclp_config.c
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Diffstat (limited to 'drivers/s390/char/sclp_config.c')
-rw-r--r--drivers/s390/char/sclp_config.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
index ad05a87bc48..fff4ff485d9 100644
--- a/drivers/s390/char/sclp_config.c
+++ b/drivers/s390/char/sclp_config.c
@@ -8,6 +8,7 @@
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/cpu.h>
+#include <linux/kthread.h>
#include <linux/sysdev.h>
#include <linux/workqueue.h>
#include <asm/smp.h>
@@ -40,9 +41,19 @@ static void sclp_cpu_capability_notify(struct work_struct *work)
put_online_cpus();
}
-static void __ref sclp_cpu_change_notify(struct work_struct *work)
+static int sclp_cpu_kthread(void *data)
{
smp_rescan_cpus();
+ return 0;
+}
+
+static void __ref sclp_cpu_change_notify(struct work_struct *work)
+{
+ /* Can't call smp_rescan_cpus() from workqueue context since it may
+ * deadlock in case of cpu hotplug. So we have to create a kernel
+ * thread in order to call it.
+ */
+ kthread_run(sclp_cpu_kthread, NULL, "cpu_rescan");
}
static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
@@ -74,10 +85,8 @@ static int __init sclp_conf_init(void)
INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
rc = sclp_register(&sclp_conf_register);
- if (rc) {
- printk(KERN_ERR TAG "failed to register (%d).\n", rc);
+ if (rc)
return rc;
- }
if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
printk(KERN_WARNING TAG "no configuration management.\n");