proc: fix return value of proc_reg_open() in "too late" case

If ->open() wasn't called, returning 0 is misleading and, theoretically,
oopsable:
1) remove_proc_entry clears ->proc_fops, drops lock,
2) ->open "succeeds",
3) ->release oopses, because it assumes ->open was called (single_release()).

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 8bb03f056c2..c6b4fa7e3b4 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -342,7 +342,7 @@ static int proc_reg_open(struct inode *inode, struct file *file)
         if (!pde->proc_fops) {
                 spin_unlock(&pde->pde_unload_lock);
                 kfree(pdeo);
-                return rv;
+                return -EINVAL;
         }
         pde->pde_users++;
         open = pde->proc_fops->open;