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regmap: cache Fix regcache-rbtree sync

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commit 8abac3ba51 upstream.

The last register block, which falls into the specified range, is not handled
correctly. The formula which calculates the number of register which should be
synced is inverse (and off by one). E.g. if all registers in that block should
be synced only one is synced, and if only one should be synced all (but one) are
synced. To calculate the number of registers that need to be synced we need to
subtract the number of the first register in the block from the max register
number and add one. This patch updates the code accordingly.

The issue was introduced in commit ac8d91c ("regmap: Supply ranges to the sync
operations").

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lars-Peter Clausen
2013-03-13 16:38:33 +01:00
committed by Greg Kroah-Hartman
parent 5d05e0b850
commit bbe2d01529
1 changed files with 1 additions and 1 deletions
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2
drivers/base/regmap/regcache-rbtree.c
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@@ -398,7 +398,7 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min,
base = 0;
if (max < rbnode->base_reg + rbnode->blklen)
end = rbnode->base_reg + rbnode->blklen - max;
end = max - rbnode->base_reg + 1;
else
end = rbnode->blklen;