module: add MODULE_STATE_GOING notifier call

Provide module unload callback. Required by the gcov profiling
infrastructure to keep track of profiling data structures.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/kernel/module.c b/kernel/module.c
index d2d093e..8674a39 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -745,12 +745,13 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
        if (!forced && module_refcount(mod) != 0)
                wait_for_zero_refcount(mod);
 
+       mutex_unlock(&module_mutex);
        /* Final destruction now noone is using it. */
-       if (mod->exit != NULL) {
-               mutex_unlock(&module_mutex);
+       if (mod->exit != NULL)
                mod->exit();
-               mutex_lock(&module_mutex);
-       }
+       blocking_notifier_call_chain(&module_notify_list,
+                                    MODULE_STATE_GOING, mod);
+       mutex_lock(&module_mutex);
        /* Store the name of the last unloaded module for diagnostic purposes */
        strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
        free_module(mod);
@@ -2191,6 +2192,8 @@ sys_init_module(void __user *umod,
                mod->state = MODULE_STATE_GOING;
                synchronize_sched();
                module_put(mod);
+               blocking_notifier_call_chain(&module_notify_list,
+                                            MODULE_STATE_GOING, mod);
                mutex_lock(&module_mutex);
                free_module(mod);
                mutex_unlock(&module_mutex);