linux-kernel - Re: [PATCH] driver core: auxiliary bus: Fix calling stage for auxiliary bus init

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Date:   Wed, 10 Feb 2021 07:44:41 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Dave Jiang <dave.jiang@...el.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Dave Ertman <david.m.ertman@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver core: auxiliary bus: Fix calling stage for
 auxiliary bus init

On Tue, Feb 09, 2021 at 12:01:06PM -0800, Dan Williams wrote:
> On Tue, Feb 9, 2021 at 11:16 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> [..]
> > > diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> > > index 8336535f1e11..53f93a506626 100644
> > > --- a/drivers/base/auxiliary.c
> > > +++ b/drivers/base/auxiliary.c
> > > @@ -270,7 +270,7 @@ static void __exit auxiliary_bus_exit(void)
> > >       bus_unregister(&auxiliary_bus_type);
> > >  }
> > >
> > > -module_init(auxiliary_bus_init);
> > > +subsys_initcall(auxiliary_bus_init);
> >
> > Ah, the linker priority dance.  Are you _SURE_ this will solve this?
> 
> All users are module_init() today so it will work.... today. The
> moment someone wants to use it in a built-in driver that uses
> subsystem_init() it will ultimately be chased into driver_init().
> 
> > Why not just call this explicitly in driver_init() so that you know it
> > will be ok?  Just like we do for the platform bus?
> 
> Cross that bridge when / if it happens?

Let's fix it properly now please.

thanks,

greg k-h