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>
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 8bb03f0..c6b4fa7 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -342,7 +342,7 @@
if (!pde->proc_fops) {
spin_unlock(&pde->pde_unload_lock);
kfree(pdeo);
- return rv;
+ return -EINVAL;
}
pde->pde_users++;
open = pde->proc_fops->open;