regmap: regmap_raw_read return error on !bus->read
Return -ENOTSUPP if map->bus->read is not implemented and we do not use
the cache. This code path would directly use bus->read would run into an
NULL pointer for the read function.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 7111d04..fc14a7c 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2184,6 +2184,11 @@
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
map->cache_type == REGCACHE_NONE) {
+ if (!map->bus->read) {
+ ret = -ENOTSUPP;
+ goto out;
+ }
+
/* Physical block read if there's no cache involved */
ret = _regmap_raw_read(map, reg, val, val_len);