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[3/5] nvmem: core: Allow ignoring length when reading a cell

Message ID 1485126160-3892-5-git-send-email-srinivas.kandagatla@linaro.org
State New
Headers show
Series nvmem: patches for v4.11 | expand

Commit Message

Srinivas Kandagatla Jan. 22, 2017, 11:02 p.m. UTC 
From: Vivek Gautam <vivek.gautam@codeaurora.org>


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>

---
 drivers/nvmem/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

-- 
2.7.4
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Patch

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 398ea7f..78aa06a 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().