regmap: regcache-rbtree: Clean new present bits on present bitmap resize
authorGuenter Roeck <linux@roeck-us.net>
Mon, 27 Jul 2015 04:34:50 +0000 (21:34 -0700)
committerMark Brown <broonie@kernel.org>
Wed, 29 Jul 2015 14:10:13 +0000 (15:10 +0100)
commit8ef9724bf9718af81cfc5132253372f79c71b7e2
tree555b99af183bc6798d1b08b3f01f70d18b6eb3ba
parentd770e558e21961ad6cfdf0ff7df0eb5d7d4f0754
regmap: regcache-rbtree: Clean new present bits on present bitmap resize

When inserting a new register into a block, the present bit map size is
increased using krealloc. krealloc does not clear the additionally
allocated memory, leaving it filled with random values. Result is that
some registers are considered cached even though this is not the case.

Fix the problem by clearing the additionally allocated memory. Also, if
the bitmap size does not increase, do not reallocate the bitmap at all
to reduce overhead.

Fixes: 3f4ff561bc88 ("regmap: rbtree: Make cache_present bitmap per node")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
drivers/base/regmap/regcache-rbtree.c