From: Ryan Kennedy <ryan5544@gmail.com>
Date: Sat, 15 Jul 2017 17:48:18 -0400
Subject: ACPI / watchdog: Fix init failure with overlapping register regions
Patch-mainline: v4.13
Git-commit: 31e86cb99a3af0653f0e317fdd9c05b530c70af8
References: bsc#1162557

Partially overlapping regions cause platform device creation
to fail. The latter of two overlapping resources will fail to be
reserved. Fix this by merging overlapping resource ranges while
enumerating WDAT table entries.

Signed-off-by: Ryan Kennedy <ryan5544@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Jean Delvare <jdelvare@suse.de>

---
 drivers/acpi/acpi_watchdog.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/acpi/acpi_watchdog.c
+++ b/drivers/acpi/acpi_watchdog.c
@@ -86,7 +86,12 @@ void __init acpi_watchdog_init(void)
 
 		found = false;
 		resource_list_for_each_entry(rentry, &resource_list) {
-			if (resource_contains(rentry->res, &res)) {
+			if (rentry->res->flags == res.flags &&
+			    resource_overlaps(rentry->res, &res)) {
+				if (res.start < rentry->res->start)
+					rentry->res->start = res.start;
+				if (res.end > rentry->res->end)
+					rentry->res->end = res.end;
 				found = true;
 				break;
 			}