On Sunday 23 October 2016 12:22:13 Pavel Machek wrote: > Hi! > > I tried to update camera code on n900 to v4.9-rc1, and I'm getting > some divide by zero, that eventually cascades into fcam-dev not > working. > > mul is zero in my testing, resulting in divide by zero. > > (Note that this is going from my patched camera-v4.8 tree to > camera-v4.9 tree.) > > Best regards, > Pavel
Hi! Ideally look at existing camera patches. I do not know which one is last, but here are some links: https://github.com/freemangordon/linux-n900/tree/v4.6-rc4-n900-camera https://github.com/freemangordon/linux-n900/tree/camera https://git.kernel.org/cgit/linux/kernel/git/sre/linux-n900.git/log/?h=n900-camera-ivo https://git.kernel.org/cgit/linux/kernel/git/sre/linux-n900.git/log/?h=n900-camera > diff --git a/drivers/media/i2c/smiapp-pll.c > b/drivers/media/i2c/smiapp-pll.c index 5ad1edb..e0a6edd 100644 > --- a/drivers/media/i2c/smiapp-pll.c > +++ b/drivers/media/i2c/smiapp-pll.c > @@ -16,6 +16,8 @@ > * General Public License for more details. > */ > > +#define DEBUG > + > #include <linux/device.h> > #include <linux/gcd.h> > #include <linux/lcm.h> > @@ -457,6 +459,10 @@ int smiapp_pll_calculate(struct device *dev, > i = gcd(pll->pll_op_clk_freq_hz, pll->ext_clk_freq_hz); > mul = div_u64(pll->pll_op_clk_freq_hz, i); > div = pll->ext_clk_freq_hz / i; > + if (!mul) { > + dev_err(dev, "forcing mul to 1\n"); > + mul = 1; > + } > dev_dbg(dev, "mul %u / div %u\n", mul, div); > > min_pre_pll_clk_div = Is not this patch still enough? https://patchwork.kernel.org/patch/8921761/ -- Pali Rohár pali.ro...@gmail.com
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