s390/ap: modularize ap bus

There is no hard requirement to have the ap bus statically in the
kernel, so add an option to compile it as module.

Cc: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Holger Dengler <dengler@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

3 files changed, 28 insertions, 6 deletions

diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index b0f6b3201636..81d6744e1861 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -32,7 +32,7 @@ obj-$(CONFIG_SCLP_VT220_TTY) += sclp_vt220.o
 
 obj-$(CONFIG_PCI) += sclp_pci.o
 
-obj-$(subst m,y,$(CONFIG_ZCRYPT)) += sclp_ap.o
+obj-$(subst m,y,$(CONFIG_AP)) += sclp_ap.o
 
 obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
 obj-$(CONFIG_VMCP) += vmcp.o
diff --git a/drivers/s390/crypto/Makefile b/drivers/s390/crypto/Makefile
index 0edacd101c12..bd94811fd9f1 100644
--- a/drivers/s390/crypto/Makefile
+++ b/drivers/s390/crypto/Makefile
@@ -4,7 +4,7 @@
 #
 
 ap-objs := ap_bus.o ap_card.o ap_queue.o
-obj-$(subst m,y,$(CONFIG_ZCRYPT)) += ap.o
+obj-$(CONFIG_AP) += ap.o
 # zcrypt_api.o and zcrypt_msgtype*.o depend on ap.o
 zcrypt-objs := zcrypt_api.o zcrypt_card.o zcrypt_queue.o
 zcrypt-objs += zcrypt_msgtype6.o zcrypt_msgtype50.o
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 9284ae63074d..09059b3a3a42 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -44,9 +44,10 @@
 #include "ap_bus.h"
 #include "ap_debug.h"
 
-/*
- * Module parameters; note though this file itself isn't modular.
- */
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("Adjunct Processor Bus driver");
+MODULE_LICENSE("GPL");
+
 int ap_domain_index = -1;	/* Adjunct Processor Domain Index */
 static DEFINE_SPINLOCK(ap_domain_lock);
 module_param_named(domain, ap_domain_index, int, 0440);
@@ -2284,6 +2285,16 @@ static void ap_scan_bus_wq_callback(struct work_struct *unused)
 	}
 }
 
+static inline void __exit ap_async_exit(void)
+{
+	if (ap_thread_flag)
+		ap_poll_thread_stop();
+	chsc_notifier_unregister(&ap_bus_nb);
+	cancel_work(&ap_scan_bus_work);
+	hrtimer_cancel(&ap_poll_timer);
+	timer_delete(&ap_scan_bus_timer);
+}
+
 static inline int __init ap_async_init(void)
 {
 	int rc;
@@ -2451,4 +2462,15 @@ out:
 	ap_debug_exit();
 	return rc;
 }
-device_initcall(ap_module_init);
+
+static void __exit ap_module_exit(void)
+{
+	ap_async_exit();
+	ap_irq_exit();
+	root_device_unregister(ap_root_device);
+	bus_unregister(&ap_bus_type);
+	ap_debug_exit();
+}
+
+module_init(ap_module_init);
+module_exit(ap_module_exit);