diff options
| author | Elaine Zhang <zhangqing@rock-chips.com> | 2016-08-18 12:01:55 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-08-18 13:09:12 +0300 |
| commit | 815806e39bf6f7e7b34875d4a9609dbe76661782 (patch) | |
| tree | 159196282922d63c2c2a5dc52f7f6053060fb0f2 /drivers/base | |
| parent | b2c7f5d9c939a37c1ce7f86a642de70e3033ee9e (diff) | |
| download | linux-815806e39bf6f7e7b34875d4a9609dbe76661782.tar.xz | |
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 51fa7d66a393..25d26bb18970 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -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); |