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-testing 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 be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 955bc61328dc0a297fb3baccd84e9d3aee501ed8 Mon Sep 17 00:00:00 2001

From: Stefan Potyra Stefan.Potyra@elektrobit.com 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 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(-)

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; }