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Subject[PATCH 0/1] regmap: drop cache if the bus transfer error
Date
regmap_write
->_regmap_raw_write
-->regcache_write first and than use map->bus->write to wirte i2c or spi
But if the i2c or spi transfer failed, But the cache is updated, So if I use
regmap_read will get the cache data which is not the real register value.

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
---
drivers/base/regmap/regmap.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 1f011f9d6dcb..369a4c3c933e 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1497,6 +1497,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
ret = map->bus->write(map->bus_context, buf, len);

kfree(buf);
+ } else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
+ regcache_drop_region(map, reg, reg + 1);
}

trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
--
1.9.1

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