uprobes: fold __uprobe_unregister() into uprobe_unregister()

Fold __uprobe_unregister() into its single caller, uprobe_unregister().
A separate patch to simplify the next change.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20240801132744.GA8814@redhat.com

Author: oleg-nesterov

kernel/events/uprobes.c

@@ -1085,30 +1085,25 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new)
 	return err;
 }
 
-static void
-__uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
-{
-	int err;
-
-	if (WARN_ON(!consumer_del(uprobe, uc)))
-		return;
-
-	err = register_for_each_vma(uprobe, NULL);
-	/* TODO : cant unregister? schedule a worker thread */
-	if (!uprobe->consumers && !err)
-		delete_uprobe(uprobe);
-}
-
 /**
  * uprobe_unregister - unregister an already registered probe.
  * @uprobe: uprobe to remove
  * @uc: identify which probe if multiple probes are colocated.
  */
 void uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
 {
+	int err;
+
 	get_uprobe(uprobe);
 	down_write(&uprobe->register_rwsem);
-	__uprobe_unregister(uprobe, uc);
+	if (WARN_ON(!consumer_del(uprobe, uc)))
+		err = -ENOENT;
+	else
+		err = register_for_each_vma(uprobe, NULL);
+
+	/* TODO : cant unregister? schedule a worker thread */
+	if (!err && !uprobe->consumers)
+		delete_uprobe(uprobe);
 	up_write(&uprobe->register_rwsem);
 	put_uprobe(uprobe);
 }