On Mon, 16 Jun 2014, Lan Tianyu wrote:
> >> How about this?
> >>
> >> - result = acpi_battery_update(battery, false);
> >> - if (result)
> >> +
> >> + /*
> >> + * Some machines'(E,G Lenovo Z480) ECs are not stable
> >> + * during boot up and this causes battery driver fails to be
> >> + * probed due to failure of getting battery information
> >> + * from EC sometimes. After several retries, the operation
> >> + * may work. So add retry code here and 20ms sleep between
> >> + * every retries.
> >> + */
> >> + while (acpi_battery_update(battery, false) && retry--)
> >> + msleep(20);
> >> + if (!retry) {
> >> + result = -ENODEV;
> >> goto fail;
> >> + }
> >> +
> >
> > I think you want --retry and not retry--.
>
> My original purpose is to retry 5 times after the first try fails.
> If use "--retry" here, it just retries 4 times.
>
> > Otherwise it's possible for the
> > final call to acpi_battery_update() to succeed and now it's returning
> > -ENODEV.
> >
>
> Yes, it maybe and I will change code like the following.
>
> while ((result = acpi_battery_update(battery, false)) && retry--)
> msleep(20);
> if (result)
> goto fail;
>
Looks good.
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