1 files changed, 18 insertions, 29 deletions

diff --git a/kernel/module.c b/kernel/module.c
index d856e96..82dc1f8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1225,6 +1225,12 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod,
 	const unsigned long *crc;
 	int err;
 
+	/*
+	 * The module_mutex should not be a heavily contended lock;
+	 * if we get the occasional sleep here, we'll go an extra iteration
+	 * in the wait_event_interruptible(), which is harmless.
+	 */
+	sched_annotate_sleep();
 	mutex_lock(&module_mutex);
 	sym = find_symbol(name, &owner, &crc,
 			  !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
@@ -2978,6 +2984,12 @@ static bool finished_loading(const char *name)
 	struct module *mod;
 	bool ret;
 
+	/*
+	 * The module_mutex should not be a heavily contended lock;
+	 * if we get the occasional sleep here, we'll go an extra iteration
+	 * in the wait_event_interruptible(), which is harmless.
+	 */
+	sched_annotate_sleep();
 	mutex_lock(&module_mutex);
 	mod = find_module_all(name, strlen(name), true);
 	ret = !mod || mod->state == MODULE_STATE_LIVE
@@ -3120,32 +3132,6 @@ static int may_init_module(void)
 }
 
 /*
- * Can't use wait_event_interruptible() because our condition
- * 'finished_loading()' contains a blocking primitive itself (mutex_lock).
- */
-static int wait_finished_loading(struct module *mod)
-{
-	DEFINE_WAIT_FUNC(wait, woken_wake_function);
-	int ret = 0;
-
-	add_wait_queue(&module_wq, &wait);
-	for (;;) {
-		if (finished_loading(mod->name))
-			break;
-
-		if (signal_pending(current)) {
-			ret = -ERESTARTSYS;
-			break;
-		}
-
-		wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
-	}
-	remove_wait_queue(&module_wq, &wait);
-
-	return ret;
-}
-
-/*
  * We try to place it in the list now to make sure it's unique before
  * we dedicate too many resources.  In particular, temporary percpu
  * memory exhaustion.
@@ -3165,8 +3151,8 @@ again:
 		    || old->state == MODULE_STATE_UNFORMED) {
 			/* Wait in case it fails to load. */
 			mutex_unlock(&module_mutex);
-
-			err = wait_finished_loading(mod);
+			err = wait_event_interruptible(module_wq,
+					       finished_loading(mod->name));
 			if (err)
 				goto out_unlocked;
 			goto again;
@@ -3265,7 +3251,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	mod->sig_ok = info->sig_ok;
 	if (!mod->sig_ok) {
 		pr_notice_once("%s: module verification failed: signature "
-			       "and/or  required key missing - tainting "
+			       "and/or required key missing - tainting "
 			       "kernel\n", mod->name);
 		add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
 	}
@@ -3356,6 +3342,9 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	module_bug_cleanup(mod);
 	mutex_unlock(&module_mutex);
 
+	/* Free lock-classes: */
+	lockdep_free_key_range(mod->module_core, mod->core_size);
+
 	/* we can't deallocate the module until we clear memory protection */
 	unset_module_init_ro_nx(mod);
 	unset_module_core_ro_nx(mod);