linux-kernel - Re: [PATCH] RFC: AMBA bus discardable probe() function

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Message-Id: <201008042343.27043.dmitry.torokhov@gmail.com>
Date:	Wed, 4 Aug 2010 23:43:26 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Linus WALLEIJ <linus.walleij@...ricsson.com>
Cc:	Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Russell King <linux@....linux.org.uk>,
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
	Viresh KUMAR <viresh.kumar@...com>
Subject: Re: [PATCH] RFC: AMBA bus discardable probe() function

On Wednesday, August 04, 2010 11:26:00 pm Linus WALLEIJ wrote:
> [Greg]
> 
> > [Me]
> > 
> > > +	spin_lock(&amba_bustype.p->klist_drivers.k_lock);
> > 
> > Ick, nope, you can't do this, sorry.  That's a "private" structure for
> > a reason.
> 
> Yeah I get it, but in the platform bus case what's that traversal of
> the klists actually for? I didn't get it, and was guessing that it
> was considering the case where devices spawn new devices.

It is to check if the driver actually bound to any devices and fail driver
registration if it did not - then, in case of modular build, entire driver
module might get unloaded from memory as well.

-- 
Dmitry
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