From: Stefan Potyra Date: Wed, 2 May 2018 08:55:31 +0000 (+0200) Subject: w1: mxc_w1: Enable clock before calling clk_get_rate() on it X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e6ef46cb8f01b67266a1adc1c323b5b67086b8e8;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git w1: mxc_w1: Enable clock before calling clk_get_rate() on it commit 955bc61328dc0a297fb3baccd84e9d3aee501ed8 upstream. 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 --- 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; }