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regmap: Reject fast_io regmap configurations with RBTREE and MAPLE caches

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REGCACHE_RBTREE and REGCACHE_MAPLE dynamically allocate memory for regmap
operations. This is incompatible with spinlock based locking which is used
for fast_io operations. Reject affected configurations.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230720032848.1306349-2-linux@roeck-us.net
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Guenter Roeck 2023-07-19 20:28:48 -07:00 committed by Mark Brown
parent 99aae70551
commit ee43f5bb23
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1 changed files with 9 additions and 0 deletions
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9
drivers/base/regmap/regmap.c
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@ -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;