[PATCH] nvmem: core: fix read_buffer in place

[Jorge Ramirez-Ortiz]

All unused/extra bytes in the cell buffer must be zeroed.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-or...@linaro.org>
---
 drivers/nvmem/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index f7301bb4ef3b..65e198adebac 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1162,7 +1162,7 @@ EXPORT_SYMBOL_GPL(nvmem_cell_put);
 static void nvmem_shift_read_buffer_in_place(struct nvmem_cell *cell, void 
*buf)
 {
        u8 *p, *b;
-       int i, bit_offset = cell->bit_offset;
+       int i, extra, bit_offset = cell->bit_offset;
 
        p = b = buf;
        if (bit_offset) {
@@ -1179,7 +1179,8 @@ static void nvmem_shift_read_buffer_in_place(struct 
nvmem_cell *cell, void *buf)
                }
 
                /* result fits in less bytes */
-               if (cell->bytes != DIV_ROUND_UP(cell->nbits, BITS_PER_BYTE))
+               extra = cell->bytes - DIV_ROUND_UP(cell->nbits, BITS_PER_BYTE);
+               while (--extra >= 0)
                        *p-- = 0;
        }
        /* clear msb bits if any leftover in the last byte */
-- 
2.20.1