linux-kernel - Re: [PATCH] x86, i8259: Only register sysdev for real PIC

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Message-ID: <20100603090141.GA15516@os.inf.tu-dresden.de>
Date:	Thu, 3 Jun 2010 11:01:41 +0200
From:	Adam Lackorzynski <adam@...inf.tu-dresden.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jacob Pan <jacob.jun.pan@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, i8259: Only register sysdev for real PIC


On Wed Jun 02, 2010 at 18:18:14 -0700, Andrew Morton wrote:
> On Wed, 2 Jun 2010 13:31:50 +0200 Adam Lackorzynski <adam@...inf.tu-dresden.de> wrote:
> 
> > Do not register the sysdev function when the null_legacy_pic is used so
> > that the i8259 resume, suspend and shutdown functions are not called.
> 
> What are the effects of this change?  Does it fix an oops or a hang, or
> nothing at all, or...?
 
My platform makes use of the null_legacy_pic choice and oopses when
doing a shutdown as the shutdown code goes through all the registered
sysdevs and calls their shutdown method which in my case poke on a
non-existing i8259. Imho the i8259 specific sysdev should only be
registered if the i8259 is actually there.


Adam
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