md/raid5: avoid races when changing cache size.

[firefly-linux-kernel-4.4.55.git] / drivers / md / raid5.h

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 02c3bf8fbfe7aa1b0a1c568605393dc3769c6b18..d05144278690ca9b8cb4ad933d6d23dc36b9b0f8 100644 (file)
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -482,7 +482,8 @@ struct r5conf {
         */
        int                     active_name;
        char                    cache_name[2][32];
-       struct kmem_cache               *slab_cache; /* for allocating stripes */
+       struct kmem_cache       *slab_cache; /* for allocating stripes */
+       struct mutex            cache_size_mutex; /* Protect changes to cache size */
 
        int                     seq_flush, seq_write;
        int                     quiesce;