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Subject[PATCH] 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>
---

fs/proc/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -350,7 +350,7 @@ 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;


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