s390/zcrypt: use system work queue for ap_scan_bus

There is a system work queue system_long_wq for long running work.
Use this work queue for the AP bus scan loop.

Reviewd-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 1d61c8698425d7d2f84c49e8d92d95f0e0246851..9cb3dfbcaddbc491f537fc431471a16a98f50b69 100644 (file)
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -76,13 +76,12 @@ static DEFINE_SPINLOCK(ap_device_list_lock);
 static LIST_HEAD(ap_device_list);
 
 /*
- * Workqueue & timer for bus rescan.
+ * Workqueue timer for bus rescan.
  */
-static struct workqueue_struct *ap_work_queue;
 static struct timer_list ap_config_timer;
 static int ap_config_time = AP_CONFIG_TIME;
 static void ap_scan_bus(struct work_struct *);
-static DECLARE_WORK(ap_config_work, ap_scan_bus);
+static DECLARE_WORK(ap_scan_work, ap_scan_bus);
 
 /*
  * Tasklet & timer for AP request polling and interrupts
@@ -1247,7 +1246,7 @@ static void ap_bus_suspend(void)
         * Disable scanning for devices, thus we do not want to scan
         * for them after removing.
         */
-       flush_workqueue(ap_work_queue);
+       flush_work(&ap_scan_work);
        tasklet_disable(&ap_tasklet);
 }
 
@@ -1280,7 +1279,7 @@ static void ap_bus_resume(void)
        if (ap_airq_flag)
                xchg(ap_airq.lsi_ptr, 0);
        tasklet_enable(&ap_tasklet);
-       queue_work(ap_work_queue, &ap_config_work);
+       queue_work(system_long_wq, &ap_scan_work);
 }
 
 static int ap_power_event(struct notifier_block *this, unsigned long event,
@@ -1406,8 +1405,8 @@ void ap_bus_force_rescan(void)
                return;
        /* processing a asynchronous bus rescan */
        del_timer(&ap_config_timer);
-       queue_work(ap_work_queue, &ap_config_work);
-       flush_work(&ap_config_work);
+       queue_work(system_long_wq, &ap_scan_work);
+       flush_work(&ap_scan_work);
 }
 EXPORT_SYMBOL(ap_bus_force_rescan);
 
@@ -1696,7 +1695,7 @@ static void ap_config_timeout(unsigned long ptr)
 {
        if (ap_suspend_flag)
                return;
-       queue_work(ap_work_queue, &ap_config_work);
+       queue_work(system_long_wq, &ap_scan_work);
 }
 
 static void ap_reset_domain(void)
@@ -1784,12 +1783,6 @@ int __init ap_module_init(void)
        if (rc)
                goto out_bus;
 
-       ap_work_queue = create_singlethread_workqueue("kapwork");
-       if (!ap_work_queue) {
-               rc = -ENOMEM;
-               goto out_root;
-       }
-
        /* Setup the AP bus rescan timer. */
        setup_timer(&ap_config_timer, ap_config_timeout, 0);
 
@@ -1814,7 +1807,7 @@ int __init ap_module_init(void)
        if (rc)
                goto out_pm;
 
-       queue_work(ap_work_queue, &ap_config_work);
+       queue_work(system_long_wq, &ap_scan_work);
 
        return 0;
 
@@ -1822,8 +1815,6 @@ out_pm:
        ap_poll_thread_stop();
 out_work:
        hrtimer_cancel(&ap_poll_timer);
-       destroy_workqueue(ap_work_queue);
-out_root:
        root_device_unregister(ap_root_device);
 out_bus:
        while (i--)
@@ -1850,7 +1841,6 @@ void ap_module_exit(void)
        ap_poll_thread_stop();
        del_timer_sync(&ap_config_timer);
        hrtimer_cancel(&ap_poll_timer);
-       destroy_workqueue(ap_work_queue);
        tasklet_kill(&ap_tasklet);
        bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister);
        for (i = 0; ap_bus_attrs[i]; i++)