lib/bug: Use RCU list ops for module_bug_list

Actually since module_bug_list should be used in BUG context,
we may not need this. But for someone who want to use this
from normal context, this makes module_bug_list an RCU list.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/module.c b/kernel/module.c
index bed608b8c8a6..d596a306b0a1 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1850,9 +1850,10 @@ static void free_module(struct module *mod)
         mutex_lock(&module_mutex);
         /* Unlink carefully: kallsyms could be walking list. */
         list_del_rcu(&mod->list);
-        /* Wait for RCU synchronizing before releasing mod->list. */
-        synchronize_rcu();
+        /* Remove this module from bug list, this uses list_del_rcu */
         module_bug_cleanup(mod);
+        /* Wait for RCU synchronizing before releasing mod->list and buglist. */
+        synchronize_rcu();
         mutex_unlock(&module_mutex);
 
         /* This may be NULL, but that's OK */