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-rw-r--r--fs/drop_caches.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 31f4b0e..9cd4e4a 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -40,6 +40,8 @@ static void drop_pagecache(void)
spin_lock(&sb_lock);
restart:
list_for_each_entry(sb, &super_blocks, s_list) {
+ if (list_empty(&sb->s_instances))
+ continue;
sb->s_count++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
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