drm/i915: Check for dev->primary->master before dereference.

[safe/jmp/linux-2.6] / fs / drop_caches.c

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index e2c6b65..3e5637f 100644 (file)
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -14,15 +14,23 @@ int sysctl_drop_caches;
 
 static void drop_pagecache_sb(struct super_block *sb)
 {
-       struct inode *inode;
+       struct inode *inode, *toput_inode = NULL;
 
        spin_lock(&inode_lock);
        list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
                if (inode->i_state & (I_FREEING|I_WILL_FREE))
                        continue;
+               if (inode->i_mapping->nrpages == 0)
+                       continue;
+               __iget(inode);
+               spin_unlock(&inode_lock);
                __invalidate_mapping_pages(inode->i_mapping, 0, -1, true);
+               iput(toput_inode);
+               toput_inode = inode;
+               spin_lock(&inode_lock);
        }
        spin_unlock(&inode_lock);
+       iput(toput_inode);
 }
 
 static void drop_pagecache(void)