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 <stefan.pot...@elektrobit.com> --- drivers/w1/masters/mxc_w1.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c index 74f2e6e6202a..a9599027d4ef 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, @@ -128,10 +132,6 @@ static int mxc_w1_probe(struct platform_device *pdev) if (IS_ERR(mdev->regs)) return PTR_ERR(mdev->regs); - err = clk_prepare_enable(mdev->clk); - if (err) - return err; - /* Software reset 1-Wire module */ writeb(MXC_W1_RESET_RST, mdev->regs + MXC_W1_RESET); writeb(0, mdev->regs + MXC_W1_RESET); -- 2.17.0