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regmap: reject volatile update_bits() in cache-only mode

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Prevent _regmap_update_bits() from accessing hardware when the register
map is in cache-only mode.

Unlike regmap_raw_read() and _regmap_read(), the volatile
_regmap_update_bits() fast path bypasses the cache_only check. This can
result in unexpected hardware accesses while the device is suspended.

Return -EBUSY to ensure behavior is consistent with other cache-only
access paths.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
Link: https://patch.msgid.link/20260528053204.46783-1-phucduc.bui@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
bui duc phuc 2026-05-28 12:32:04 +07:00 committed by Mark Brown
parent e7ae89a0c9
commit 006c66d1d5
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1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap.c
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@ -3257,6 +3257,9 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
*change = false;
if (regmap_volatile(map, reg) && map->reg_update_bits) {
if (map->cache_only)
return -EBUSY;
reg = regmap_reg_addr(map, reg);
ret = map->reg_update_bits(map->bus_context, reg, mask, val);
if (ret == 0 && change)