regmap: debugfs: Ensure a correct return value for empty caches

This should never happen in the real world.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 9099cd33fbcb..720e14248167 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -116,6 +116,16 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
                 }
         }
 
+        /*
+         * This should never happen; we return above if we fail to
+         * allocate and we should never be in this code if there are
+         * no registers at all.
+         */
+        if (list_empty(&map->debugfs_off_cache)) {
+                WARN_ON(list_empty(&map->debugfs_off_cache));
+                return base;
+        }
+
         /* Find the relevant block */
         list_for_each_entry(c, &map->debugfs_off_cache, list) {
                 if (from >= c->min && from <= c->max) {