Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753313AbcLSGxV (ORCPT ); Mon, 19 Dec 2016 01:53:21 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:34600 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751152AbcLSGxU (ORCPT ); Mon, 19 Dec 2016 01:53:20 -0500 DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org 3DA0F6145B Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=pass smtp.mailfrom=vivek.gautam@codeaurora.org From: Vivek Gautam To: srinivas.kandagatla@linaro.org, maxime.ripard@free-electrons.com Cc: sboyd@codeaurora.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Vivek Gautam Subject: [PATCH] nvmem: core: Allow ignoring length when reading a cell Date: Mon, 19 Dec 2016 12:23:09 +0530 Message-Id: <1482130389-3164-1-git-send-email-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1460 Lines: 42 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 --- Based on torvalds's master branch. - Tested against 'next-20161219' tag on db410c (apq8016) target for thermal sensors. 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 965911d..4c38842 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 char * buffer on success. * The buffer should be freed by the consumer with a kfree(). -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project