linux-kernel - RE: [PATCH] platform/x86: intel-hid: Use hp-wireless for rfkill on HP platforms

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Date:   Thu, 11 Jun 2020 13:14:54 +0000
From:   <Mario.Limonciello@...l.com>
To:     <kai.heng.feng@...onical.com>
CC:     <alex.hung@...onical.com>, <dvhart@...radead.org>,
        <andy@...radead.org>, <platform-driver-x86@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] platform/x86: intel-hid: Use hp-wireless for rfkill on HP
 platforms

> > Just having the ACPI device present doesn't actually mean that the user
> > has a kernel compiled with hp-wireless or that it has finished
> initializing.
> 
> We can use IS_REACHEABLE() to see if it's compiled.

Yes that was going to be my first suggestion.

> 
> >
> > I would think this needs a better handshake in case hp-wireless was
> unloaded
> > or not present so the event could still come through intel-hid in this
> > circumstance.
> 
> However, it's hard to determine if the other driver has finished
> initialization or any form of cross module handshake.
> Can you please point me to any good example if there's one?

Take a look at how drivers that use dell-wmi-descriptor work.  They can rely
upon looking at -EPROBE_DEFER return code when trying to access the functionality
and do a handoff.

> 
> >
> >> +
> >> 	return AE_OK;
> >> }
> >>
> >> --
> >> 2.17.1