diff --git a/block/genhd.c b/block/genhd.c
index 9f8cb7beaad1..ccaa5cf620f5 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -676,12 +676,14 @@ void blk_request_module(dev_t devt)
 {
 	unsigned int major = MAJOR(devt);
 	struct blk_major_name **n;
+	void (*probe)(dev_t devt);
 
 	mutex_lock(&major_names_lock);
 	for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) {
 		if ((*n)->major == major && (*n)->probe) {
-			(*n)->probe(devt);
+			probe = (*n)->probe;
 			mutex_unlock(&major_names_lock);
+			probe(devt);
 			return;
 		}
 	}