proc: avoid extra pde_put() in proc_fill_super()

If proc_get_inode() succeeded, but d_make_root() failed, pde_put() for
proc_root will be called twice: the first time due to iput() called from
d_make_root() and the second time directly in the end of
proc_fill_super().

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 15 insertions, 6 deletions

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 38f5c119b806..98a7d2870bef 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -486,6 +486,8 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
 
 int proc_fill_super(struct super_block *s)
 {
+        struct inode *root_inode;
+
         s->s_flags |= MS_NODIRATIME | MS_NOSUID | MS_NOEXEC;
         s->s_blocksize = 1024;
         s->s_blocksize_bits = 10;
@@ -494,11 +496,18 @@ int proc_fill_super(struct super_block *s)
         s->s_time_gran = 1;
         
         pde_get(&proc_root);
-        s->s_root = d_make_root(proc_get_inode(s, &proc_root));
-        if (s->s_root)
-                return 0;
+        root_inode = proc_get_inode(s, &proc_root);
+        if (!root_inode) {
+                printk(KERN_ERR "proc_fill_super: get root inode failed\n");
+                pde_put(&proc_root);
+                return -ENOMEM;
+        }
 
-        printk("proc_read_super: get root inode failed\n");
-        pde_put(&proc_root);
-        return -ENOMEM;
+        s->s_root = d_make_root(root_inode);
+        if (!s->s_root) {
+                printk(KERN_ERR "proc_fill_super: allocate dentry failed\n");
+                return -ENOMEM;
+        }
+
+        return 0;
 }