ehea: add kexec support

eHEA resources that are allocated via H_CALLs have a unique identifier each.
These identifiers are necessary to free the resources. A reboot notifier
is used to free all eHEA resources before the indentifiers get lost, i.e
before kexec starts a new kernel.

Signed-off-by: Jan-Bernd Themann <themann@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index 0a7e78925540..f0319f1e8e05 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -33,6 +33,9 @@
 #include <linux/if.h>
 #include <linux/list.h>
 #include <linux/if_ether.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+
 #include <net/ip.h>
 
 #include "ehea.h"
@@ -3295,6 +3298,20 @@ static int __devexit ehea_remove(struct of_device *dev)
         return 0;
 }
 
+static int ehea_reboot_notifier(struct notifier_block *nb,
+                                unsigned long action, void *unused)
+{
+        if (action == SYS_RESTART) {
+                ehea_info("Reboot: freeing all eHEA resources");
+                ibmebus_unregister_driver(&ehea_driver);
+        }
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block ehea_reboot_nb = {
+        .notifier_call = ehea_reboot_notifier,
+};
+
 static int check_module_parm(void)
 {
         int ret = 0;
@@ -3351,6 +3368,8 @@ int __init ehea_module_init(void)
         if (ret)
                 goto out;
 
+        register_reboot_notifier(&ehea_reboot_nb);
+
         ret = ibmebus_register_driver(&ehea_driver);
         if (ret) {
                 ehea_error("failed registering eHEA device driver on ebus");
@@ -3362,6 +3381,7 @@ int __init ehea_module_init(void)
         if (ret) {
                 ehea_error("failed to register capabilities attribute, ret=%d",
                            ret);
+                unregister_reboot_notifier(&ehea_reboot_nb);
                 ibmebus_unregister_driver(&ehea_driver);
                 goto out;
         }
@@ -3375,6 +3395,7 @@ static void __exit ehea_module_exit(void)
         flush_scheduled_work();
         driver_remove_file(&ehea_driver.driver, &driver_attr_capabilities);
         ibmebus_unregister_driver(&ehea_driver);
+        unregister_reboot_notifier(&ehea_reboot_nb);
         ehea_destroy_busmap();
 }