From 21ea6458c216abab02c9b30a5209c018e7c173a1 Mon Sep 17 00:00:00 2001
From: Todd Poynor <toddpoynor@google.com>
Date: Thu, 19 Jul 2018 20:49:07 -0700
Subject: [PATCH] staging: gasket: gasket_mmap return error instead of valid
 BAR index

When offset to be mapped matches both a BAR region and a coherent mapped
region return an error as intended, not the BAR index.

Signed-off-by: Simon Que <sque@chromium.org>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 gasket_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gasket_core.c b/gasket_core.c
index 7b912f1..43c63da 100644
--- a/gasket_core.c
+++ b/gasket_core.c
@@ -1637,7 +1637,7 @@ static int gasket_mmap(struct file *filp, struct vm_area_struct *vma)
 			"0x%lx",
 			raw_offset);
 		trace_gasket_mmap_exit(bar_index);
-		return bar_index;
+		return -EINVAL;
 	}
 
 	vma->vm_private_data = gasket_dev;