Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753313AbcDRKuF (ORCPT ); Mon, 18 Apr 2016 06:50:05 -0400 Received: from mail.kernel.org ([198.145.29.136]:34896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753290AbcDRKuB (ORCPT ); Mon, 18 Apr 2016 06:50:01 -0400 From: lizf@kernel.org To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Mark Brown , Zefan Li Subject: [PATCH 3.4 54/92] regmap: debugfs: Don't bother actually printing when calculating max length Date: Mon, 18 Apr 2016 18:45:59 +0800 Message-Id: <1460976397-5688-54-git-send-email-lizf@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1460976338-5631-1-git-send-email-lizf@kernel.org> References: <1460976338-5631-1-git-send-email-lizf@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1333 Lines: 38 From: Mark Brown 3.4.112-rc1 review patch. If anyone has any objections, please let me know. ------------------ commit 176fc2d5770a0990eebff903ba680d2edd32e718 upstream. The in kernel snprintf() will conveniently return the actual length of the printed string even if not given an output beffer at all so just do that rather than relying on the user to pass in a suitable buffer, ensuring that we don't need to worry if the buffer was truncated due to the size of the buffer passed in. Reported-by: Rasmus Villemoes Signed-off-by: Mark Brown Signed-off-by: Zefan Li --- drivers/base/regmap/regmap-debugfs.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index d805eb5..023a9d7 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -23,8 +23,7 @@ static struct dentry *regmap_debugfs_root; /* Calculate the length of a fixed format */ static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size) { - snprintf(buf, buf_size, "%x", max_val); - return strlen(buf); + return snprintf(NULL, 0, "%x", max_val); } static ssize_t regmap_name_read_file(struct file *file, -- 1.9.1