linux-kernel - Re: v4.9-rc1: smiapp divides by zero

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Date:   Sun, 23 Oct 2016 20:33:34 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>, sre@...nel.org,
        pali.rohar@...il.com, linux-media@...r.kernel.org,
        galak@...eaurora.org, mchehab@....samsung.com,
        linux-kernel@...r.kernel.org
Subject: Re: v4.9-rc1: smiapp divides by zero

Hi!

> > +#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) {
> 
> Something must be very wrong if you get here.
> 
> What are the values of pll->pll_op_clk_freq_hz and pll->ext_clk_freq_hz?
> Or... what does dmesg say?

Yep, it was very wrong. I mismerged the stuff, and hwcfg->lanes
initialization was missing. Now it appears to work.

(I have pushed the changes to camera-v4.9 branch).

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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