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module: add MODULE_STATE_GOING notifier call

RFC PATCH In review Peter Oberparleiter 1 participant 1 message Apr 21, 2008

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Peter Oberparleiter

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RFC PATCH 4/8 module: add MODULE_STATE_GOING notifier call

From: Peter Oberparleiter <[email protected]>

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

Signed-off-by Peter Oberparleiter <[email protected]>
---
 kernel/module.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)
kernel/module.c +7 -4
Index: linux-2.6.25/kernel/module.c
===================================================================
@@ -737,12 +737,13 @@ sys_delete_module(const char __user *nam
 	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);

@@ -2185,6 +2186,8 @@ 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);