linux-kernel - [PATCH 1/2] regmap: Bypass the cache when applying patches

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Message-Id: <1327525640-32260-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Wed, 25 Jan 2012 21:07:19 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	linux-kernel@...r.kernel.org
Cc:	patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 1/2] 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@...nsource.wolfsonmicro.com>
---
 drivers/base/regmap/regcache.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 0d54668..bfe48e4 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -268,6 +268,7 @@ int regcache_sync(struct regmap *map)
 	trace_regcache_sync(map->dev, name, "start");
 
 	/* 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) {
@@ -276,6 +277,7 @@ int regcache_sync(struct regmap *map)
 			goto out;
 		}
 	}
+	map->cache_bypass = 0;
 
 	if (!map->cache_dirty)
 		goto out;
-- 
1.7.9.rc1

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