]> git.karo-electronics.de Git - karo-tx-linux.git/commit
regmap: rbtree: Fix overlapping rbnodes.
authorDavid Jander <david@protonic.nl>
Wed, 21 Aug 2013 15:37:22 +0000 (17:37 +0200)
committerMark Brown <broonie@linaro.org>
Wed, 21 Aug 2013 16:03:54 +0000 (17:03 +0100)
commit4e67fb5f5e336250db944921e3c68057d6203034
tree9942efc3da08fc11c28d887f191d7ee89ee4f96a
parentb36f4be3de1b123d8601de062e7dbfc904f305fb
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
drivers/base/regmap/regcache-rbtree.c