regmap: Return a sensible error code if we fail to read the cache
If a register isn't cached then let callers know that so they can fall
back or error handle appropriately.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 40f23dd..887dbce 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -193,8 +193,7 @@
*value = regcache_rbtree_get_register(rbnode, reg_tmp,
map->cache_word_size);
} else {
- /* uninitialized registers default to 0 */
- *value = 0;
+ return -ENOENT;
}
return 0;