diff options
Diffstat (limited to 'drivers/s390/char/sclp_config.c')
| -rw-r--r-- | drivers/s390/char/sclp_config.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c index ad05a87bc480..fff4ff485d9b 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"); |