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| author | Stefan Potyra <Stefan.Potyra@elektrobit.com> | 2018-05-02 10:55:31 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-14 16:32:00 +0200 |
| commit | 955bc61328dc0a297fb3baccd84e9d3aee501ed8 (patch) | |
| tree | bd102bfd117485fe861ff3d0f9aeee93d35dcf00 /drivers/w1 | |
| parent | bd23a7269834dc7c1f93e83535d16ebc44b75eba (diff) | |
| download | linux-rpi3-955bc61328dc0a297fb3baccd84e9d3aee501ed8.tar.gz linux-rpi3-955bc61328dc0a297fb3baccd84e9d3aee501ed8.tar.bz2 linux-rpi3-955bc61328dc0a297fb3baccd84e9d3aee501ed8.zip | |
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 <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>
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/masters/mxc_w1.c | 20 |
1 files 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; } |