linux-kernel - Re: [PATCH v1 5/5] driver-core: add driver asynchronous probe support

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Message-ID: <20140929212601.GF15925@htj.dyndns.org>
Date:	Mon, 29 Sep 2014 17:26:01 -0400
From:	Tejun Heo <tj@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	gregkh@...uxfoundation.org,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	dmitry.torokhov@...il.com, tiwai@...e.de, arjan@...ux.intel.com,
	teg@...m.no, rmilasan@...e.com, werner@...e.com, oleg@...hat.com,
	hare@...e.com, bpoirier@...e.de, santosh@...lsio.com,
	pmladek@...e.cz, dbueso@...e.com, linux-kernel@...r.kernel.org,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Kay Sievers <kay@...y.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tim Gardner <tim.gardner@...onical.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v1 5/5] driver-core: add driver asynchronous probe support

Hello, Luis.

On Mon, Sep 29, 2014 at 11:22:08PM +0200, Luis R. Rodriguez wrote:
> > > +	/* For now lets avoid stupid bug reports */
> > > +	if (!strcmp(bus->name, "pci") ||
> > > +	    !strcmp(bus->name, "pci_express") ||
> > > +	    !strcmp(bus->name, "hid") ||
> > > +	    !strcmp(bus->name, "sdio") ||
> > > +	    !strcmp(bus->name, "gameport") ||
> > > +	    !strcmp(bus->name, "mmc") ||
> > > +	    !strcmp(bus->name, "i2c") ||
> > > +	    !strcmp(bus->name, "platform") ||
> > > +	    !strcmp(bus->name, "usb"))
> > > +		return true;
> > 
> > Ugh... things like this tend to become permanent.  Do we really need
> > this?  And how are we gonna find out what's broken why w/o bug
> > reports?
> 
> Yeah... well we have two options, one is have something like this to
> at least make it generally useful or remove this and let folks who
> care start fixing async for all modules. The downside to removing
> this is it makes async probe pretty much useless on most systems
> right now, it would mean systemd would have to probably consider
> the list above if they wanted to start using this without expecting
> systems to not work.

So, I'd much prefer blacklist approach if something like this is a
necessity.  That way, we'd at least know what doesn't work.

Thanks.

-- 
tejun
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