diff options
| -rw-r--r-- | drivers/base/regmap/regmap.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 8b37451fa931..6c637b18d6b0 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -723,6 +723,15 @@ struct regmap *__regmap_init(struct device *dev, } else { if ((bus && bus->fast_io) || config->fast_io) { + /* + * fast_io is incompatible with REGCACHE_RBTREE and REGCACHE_MAPLE + * since both need to dynamically allocate memory. + */ + if (config->cache_type == REGCACHE_RBTREE || + config->cache_type == REGCACHE_MAPLE) { + ret = -EINVAL; + goto err_name; + } if (config->use_raw_spinlock) { raw_spin_lock_init(&map->raw_spinlock); map->lock = regmap_lock_raw_spinlock; |