Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 6 Sep 2018 13:00:49 +0200
From:   Lukas Wunner <lukas@wunner.de>
To:     Mika Westerberg <mika.westerberg@linux.intel.com>
Cc:     linux-kernel@vger.kernel.org,
        Andreas Noever <andreas.noever@gmail.com>,
        Michael Jamet <michael.jamet@intel.com>,
        Yehezkel Bernat <YehezkelShB@gmail.com>,
        Lu Baolu <baolu.lu@linux.intel.com>
Subject: Re: [PATCH 2/2] thunderbolt: Initialize after IOMMUs
Message-ID: <20180906110049.gfdhurvkvvdjw7zh@wunner.de>
References: <20180903132012.23531-1-mika.westerberg@linux.intel.com>
 <20180903132012.23531-2-mika.westerberg@linux.intel.com>
 <20180905084746.xmckzskxzsdliz3e@wunner.de>
 <20180905094602.GH2283@lahna.fi.intel.com>
 <20180906081337.3mosfpfggfmoj633@wunner.de>
 <20180906103602.GV2283@lahna.fi.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180906103602.GV2283@lahna.fi.intel.com>
User-Agent: NeoMutt/20170113 (1.7.2)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Sep 06, 2018 at 01:36:02PM +0300, Mika Westerberg wrote:
> On Thu, Sep 06, 2018 at 10:13:37AM +0200, Lukas Wunner wrote:
> > So with this patch, you rely on the linker ordering nhi_init() after
> > ir_dev_scope_init(), however to the best of my knowledge the link
> > order is not guaranteed.
> 
> What says that?

Within the same initcall level, the ordering is determined by the Makefile
AFAIK.  Someone changes the Makefile, your dependency scheme falls apart.


> > Looking at commit acb40d841257, which started this, I'm wondering
> > why you did not simply export tbnet_init() and call it from the
> > thunderbolt driver after the property stuff has been fully set up?
> > After all, thunderbolt-net is useless without thunderbolt or am I
> > missing something?  Then you could revert back to module_init().
> 
> The same reason you don't call PCI driver functions from PCI core. It
> makes absolutely zero sense.
> 
> Thunderbolt is bus and provides driver API to drivers. We hopefully are
> getting other service drivers (say SCSI over TBT) that are going to be
> use the same interfaces.

Then add a blocking notifier chain into which these service drivers can
hook.  Other buses have that as well.

Thanks,

Lukas