From 3b4a687726f0019115bd903d9724db6cdcbb00fe Mon Sep 17 00:00:00 2001 From: Vivek Gautam Date: Sun, 22 Jan 2017 23:02:38 +0000 Subject: [PATCH] nvmem: core: Allow ignoring length when reading a cell nvmem_cell_read() API fills in the argument 'len' with the number of bytes read from the cell. Many users don't care about this length value. So allow users to pass a NULL pointer to this len field. Signed-off-by: Vivek Gautam Reviewed-by: Stephen Boyd Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 398ea7f54826..78aa06a578d0 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -970,7 +970,8 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem, if (cell->bit_offset || cell->nbits) nvmem_shift_read_buffer_in_place(cell, buf); - *len = cell->bytes; + if (len) + *len = cell->bytes; return 0; } @@ -979,7 +980,8 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem, * nvmem_cell_read() - Read a given nvmem cell * * @cell: nvmem cell to be read. - * @len: pointer to length of cell which will be populated on successful read. + * @len: pointer to length of cell which will be populated on successful read; + * can be NULL. * * Return: ERR_PTR() on error or a valid pointer to a buffer on success. The * buffer should be freed by the consumer with a kfree().