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nvmem: core: Allow ignoring length when reading a cell

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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 <vivek.gautam@codeaurora.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vivek Gautam 2017-01-22 23:02:38 +00:00 committed by Greg Kroah-Hartman
parent 1e928fff9a
commit 3b4a687726
1 changed files with 4 additions and 2 deletions
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6
drivers/nvmem/core.c
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@ -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().