Commit 815806e3 authored Aug 18, 2016 by Elaine Zhang Committed by Mark Brown Aug 18, 2016

regmap: drop cache if the bus transfer error



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>

parent b2c7f5d9

drivers/base/regmap/regmap.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);