Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932442AbbKMK7F (ORCPT ); Fri, 13 Nov 2015 05:59:05 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:48606 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753866AbbKMKKg (ORCPT ); Fri, 13 Nov 2015 05:10:36 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Mark Brown , Luis Henriques Subject: [PATCH 3.16.y-ckt 02/94] regmap: debugfs: Don't bother actually printing when calculating max length Date: Fri, 13 Nov 2015 10:08:56 +0000 Message-Id: <1447409428-12178-3-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1447409428-12178-1-git-send-email-luis.henriques@canonical.com> References: <1447409428-12178-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1607 Lines: 40 3.16.7-ckt20 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Mark Brown 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: Luis Henriques --- 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 c11e72f7ab51..a79104a2b033 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -32,8 +32,7 @@ static DEFINE_MUTEX(regmap_debugfs_early_lock); /* 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, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/