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Date: Wed, 2 Mar 2016 23:44:02 +0100 From: Joachim Eastwood <manabian@...il.com> To: Wolfram Sang <wsa@...-dreams.de> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, linux-renesas-soc@...r.kernel.org, Thierry Reding <thierry.reding@...il.com>, linux-pwm@...r.kernel.org, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "Ariel D'Alessandro" <ariel@...guardiasur.com.ar> Subject: Re: [PATCH 4/6] pwm: pwm-lpc18xx-sct: test clock rate to avoid division by 0 Hi Wolfram, On 2 March 2016 at 23:33, Wolfram Sang <wsa@...-dreams.de> wrote: > From: Wolfram Sang <wsa+renesas@...g-engineering.com> > > The clk API may return 0 on clk_get_rate, so we should check the result before > using it as a divisor. > > Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com> > --- > > Should go individually via subsystem tree. > > drivers/pwm/pwm-lpc18xx-sct.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c > index 9163085101bc94..6487962c355c03 100644 > --- a/drivers/pwm/pwm-lpc18xx-sct.c > +++ b/drivers/pwm/pwm-lpc18xx-sct.c > @@ -360,6 +360,8 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev) > } > > lpc18xx_pwm->clk_rate = clk_get_rate(lpc18xx_pwm->pwm_clk); > + if (!lpc18xx_pwm->clk_rate) > + return -EINVAL; This needs to be: if (!lpc18xx_pwm->clk_rate) { ret = -EINVAL; goto disable_pwmclk; } I would also prefer an explicit check against 0 here. ie.: 'lpc18xx_pwm->clk_rate == 0' A dev_err() message would also be nice to have. regards, Joachim Eastwood
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