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regmap: drop cache if the bus transfer error

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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>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Elaine Zhang 2016-08-18 17:01:55 +08:00 committed by Mark Brown
parent b2c7f5d9c9
commit 815806e39b
1 changed files with 2 additions and 0 deletions
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2
drivers/base/regmap/regmap.c
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@ -1474,6 +1474,8 @@ 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);