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authorDavid Jander <david@protonic.nl>2013-08-21 17:37:22 +0200
committerMark Brown <broonie@linaro.org>2013-08-21 17:03:54 +0100
commit4e67fb5f5e336250db944921e3c68057d6203034 (patch)
parentb36f4be3de1b123d8601de062e7dbfc904f305fb (diff)
regmap: rbtree: Fix overlapping rbnodes.
Avoid overlapping register regions by making the initial blklen of a new node 1. If a register write occurs to a yet uncached register, that is lower than but near an existing node's base_reg, a new node is created and it's blklen is set to an arbitrary value (sizeof(*rbnode)). That may cause this node to overlap with another node. Those nodes should be merged, but this merge doesn't happen yet, so this patch at least makes the initial blklen small enough to avoid hitting the wrong node, which may otherwise lead to severe breakage. Signed-off-by: David Jander <david@protonic.nl> Signed-off-by: Mark Brown <broonie@linaro.org> Cc: stable@vger.kernel.org
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 5c1435c4e210..0fccc99881fd 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -332,7 +332,7 @@ regcache_rbtree_node_alloc(struct regmap *map, unsigned int reg)
if (!rbnode->blklen) {
- rbnode->blklen = sizeof(*rbnode);
+ rbnode->blklen = 1;
rbnode->base_reg = reg;