4.4-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Potyra Stefan.Potyra@elektrobit.com
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 Stefan.Potyra@elektrobit.com Acked-by: Evgeniy Polyakov zbr@ioremap.net Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/w1/masters/mxc_w1.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-)
--- a/drivers/w1/masters/mxc_w1.c +++ b/drivers/w1/masters/mxc_w1.c @@ -113,6 +113,10 @@ static int mxc_w1_probe(struct platform_ 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, @@ -126,12 +130,10 @@ static int mxc_w1_probe(struct platform_
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); @@ -147,8 +149,12 @@ static int mxc_w1_probe(struct platform_
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; }