commit 8a892d6996b60c822f19ad1844eb15b96ce393c7
author Mark Brown <broonie@opensource.wolfsonmicro.com> Wed Jan 25 21:05:48 2012 +0000
committer Mark Brown <broonie@opensource.wolfsonmicro.com> Wed Jan 25 21:22:05 2012 +0000
tree e3b2281798d9188cb69f21ff9d965d1073a69957
parent d9db762708e27c2892db9d8a54e735a8e506e16e

regmap: Bypass the cache when applying patches

Otherwise any patch that affects a register which is writable may trash
cached values.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/base/regmap/regcache.c

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 9c6a5c1..ee36bed 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -273,6 +273,7 @@
 		goto out;
 
 	/* Apply any patch first */
+	map->cache_bypass = 1;
 	for (i = 0; i < map->patch_regs; i++) {
 		ret = _regmap_write(map, map->patch[i].reg, map->patch[i].def);
 		if (ret != 0) {
@@ -281,6 +282,7 @@
 			goto out;
 		}
 	}
+	map->cache_bypass = 0;
 
 	if (map->cache_ops->sync) {
 		ret = map->cache_ops->sync(map);