From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:34528 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755101AbeENQbk (ORCPT ); Mon, 14 May 2018 12:31:40 -0400 Subject: patch "w1: mxc_w1: Enable clock before calling clk_get_rate() on it" added to char-misc-next To: Stefan.Potyra@elektrobit.com, gregkh@linuxfoundation.org, stable@vger.kernel.org, zbr@ioremap.net From: Date: Mon, 14 May 2018 18:30:15 +0200 Message-ID: <152631541559184@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled w1: mxc_w1: Enable clock before calling clk_get_rate() on it to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-next branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will also be merged in the next major kernel release during the merge window. If you have any questions about this process, please let me know. >>From 955bc61328dc0a297fb3baccd84e9d3aee501ed8 Mon Sep 17 00:00:00 2001 From: Stefan Potyra Date: Wed, 2 May 2018 10:55:31 +0200 Subject: w1: mxc_w1: Enable clock before calling clk_get_rate() on it According to the API, you may only call clk_get_rate() after actually enabling it. Found by Linux Driver Verification project (linuxtesting.org). Fixes: a5fd9139f74c ("w1: add 1-wire master driver for i.MX27 / i.MX31") Signed-off-by: Stefan Potyra Acked-by: Evgeniy Polyakov Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/w1/masters/mxc_w1.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c index 74f2e6e6202a..8851d441e5fd 100644 --- a/drivers/w1/masters/mxc_w1.c +++ b/drivers/w1/masters/mxc_w1.c @@ -112,6 +112,10 @@ static int mxc_w1_probe(struct platform_device *pdev) if (IS_ERR(mdev->clk)) return PTR_ERR(mdev->clk); + err = clk_prepare_enable(mdev->clk); + if (err) + return err; + clkrate = clk_get_rate(mdev->clk); if (clkrate < 10000000) dev_warn(&pdev->dev, @@ -125,12 +129,10 @@ static int mxc_w1_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mdev->regs = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(mdev->regs)) - return PTR_ERR(mdev->regs); - - err = clk_prepare_enable(mdev->clk); - if (err) - return err; + if (IS_ERR(mdev->regs)) { + err = PTR_ERR(mdev->regs); + goto out_disable_clk; + } /* Software reset 1-Wire module */ writeb(MXC_W1_RESET_RST, mdev->regs + MXC_W1_RESET); @@ -146,8 +148,12 @@ static int mxc_w1_probe(struct platform_device *pdev) err = w1_add_master_device(&mdev->bus_master); if (err) - clk_disable_unprepare(mdev->clk); + goto out_disable_clk; + return 0; + +out_disable_clk: + clk_disable_unprepare(mdev->clk); return err; } -- 2.17.0