nvmem: core: fix read buffer in place
authorJorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Sat, 13 Apr 2019 10:32:58 +0000 (11:32 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 22 Jun 2019 06:17:15 +0000 (08:17 +0200)
commitfaa4dc52b4b227344bd66ac0fda6475749263d8b
tree776d6f99c221d8ec616e1d3d54cb63d0f5487e36
parent5844c4b20d5fab7f05b171e1a959e3c19355fa8b
nvmem: core: fix read buffer in place

[ Upstream commit 2fe518fecb3a4727393be286db9804cd82ee2d91 ]

When the bit_offset in the cell is zero, the pointer to the msb will
not be properly initialized (ie, will still be pointing to the first
byte in the buffer).

This being the case, if there are bits to clear in the msb, those will
be left untouched while the mask will incorrectly clear bit positions
on the first byte.

This commit also makes sure that any byte unused in the cell is
cleared.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/nvmem/core.c