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-rw-r--r--kernel/module.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 63cf6e7f1394..74bc19562ca3 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2845,6 +2845,20 @@ static int post_relocation(struct module *mod, const struct load_info *info)
return module_finalize(info->hdr, info->sechdrs, mod);
}
+/* Is this module of this name done loading? No locks held. */
+static bool finished_loading(const char *name)
+{
+ struct module *mod;
+ bool ret;
+
+ mutex_lock(&module_mutex);
+ mod = find_module(name);
+ ret = !mod || mod->state != MODULE_STATE_COMING;
+ mutex_unlock(&module_mutex);
+
+ return ret;
+}
+
/* Allocate and load the module: note that size of section 0 is always
zero, and we rely on this for optional sections. */
static struct module *load_module(void __user *umod,
@@ -2852,7 +2866,7 @@ static struct module *load_module(void __user *umod,
const char __user *uargs)
{
struct load_info info = { NULL, };
- struct module *mod;
+ struct module *mod, *old;
long err;
pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n",
@@ -2918,8 +2932,18 @@ static struct module *load_module(void __user *umod,
* function to insert in a way safe to concurrent readers.
* The mutex protects against concurrent writers.
*/
+again:
mutex_lock(&module_mutex);
- if (find_module(mod->name)) {
+ if ((old = find_module(mod->name)) != NULL) {
+ if (old->state == MODULE_STATE_COMING) {
+ /* Wait in case it fails to load. */
+ mutex_unlock(&module_mutex);
+ err = wait_event_interruptible(module_wq,
+ finished_loading(mod->name));
+ if (err)
+ goto free_arch_cleanup;
+ goto again;
+ }
err = -EEXIST;
goto unlock;
}

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