linux-kernel - Re: [PATCH RFC] iio: iadc: wait_for_completion

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Date:	Mon, 05 Jan 2015 17:33:16 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Jonathan Cameron <jic23@...nel.org>
Cc:	Nicholas Mc Guire <der.herr@...r.at>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC] iio: iadc: wait_for_completion_timeout time in
 jiffies


On Sun, 2015-01-04 at 11:16 +0000, Jonathan Cameron wrote:
> On 31/12/14 08:59, Nicholas Mc Guire wrote:
> > The timeout value to wait_for_completion_timeout is in jiffies but
> > the value being passed seems like it was intended to by microseconds
> > Note that the timeout was extremely long thus it might be too short
> > now. In any case it probably should be passed through usecs_to_jiffies()
> > or msecs_to_jiffies()
> > 
> > patch is against linux-next 3.19.0-rc1 -next-20141226
> > 
> > patch was only compile-tested x86_64_defcofnig + CONFIG_SPMI=m
> > CONFIG_IIO=m, CONFIG_QCOM_SPMI_IADC=m
> > 
> > Signed-off-by: Nicholas Mc Guire herr@...r.at>
> Certainly suspicious and I'd draw the same conclusion you did!
> Anyhow just waiting for Ivan to take a look as it's his driver.

Oops, true. Timeout is calculated in microseconds and have to 
be converted to jiffies.

Thanks.

Acked-by: Ivan T. Ivanov <iivanov@...sol.com>


> 
> Thanks,
> 
> Jonathan
> > ---
> >  drivers/iio/adc/qcom-spmi-iadc.c |    3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/adc/qcom-spmi-iadc.c b/drivers/iio/adc/qcom-spmi-iadc.c
> > index b9666f2..3080562 100644
> > --- a/drivers/iio/adc/qcom-spmi-iadc.c
> > +++ b/drivers/iio/adc/qcom-spmi-iadc.c
> > @@ -296,7 +296,8 @@ static int iadc_do_conversion(struct iadc_chip *iadc, int chan, u16 *data)
> >         if (iadc->poll_eoc) {
> >                 ret = iadc_poll_wait_eoc(iadc, wait);
> >         } else {
> > -               ret = wait_for_completion_timeout(&iadc->complete, wait);
> > +               ret = wait_for_completion_timeout(&iadc->complete,
> > +                       usecs_to_jiffies(wait));
> >                 if (!ret)
> >                         ret = -ETIMEDOUT;
> >                 else
> > 
> 
> 
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