Re: error to be returned while suspended

Pavel Machek
2006-10-04T22:45:00Z

Hi!

> > > which error should a character device return if a read/write cannot be
> > > serviced because the device is suspended? Shouldn't there be an error
> > > code specific to that?
> >
> > If you are talking system suspend, then userspace should not run while
> > devices are suspended.
> >
> > If you are talking runtime suspend, you should probably just wake the
> > device up on first access.
>
> Do you really think a device driver should override an explicitely
> selected power state?

(So we are talking runtime suspend?)

No, I do not know what the right interface is. I started to suspect
that drivers should suspend/resume devices automatically, without
userland help. Maybe having autosuspend_timeout in sysfs is enough.

Pavel
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