linux-kernel - Re: [PATCH] cs5520: add missing IRQ setup for the second port

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Date:	Tue, 23 Jun 2009 11:59:01 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Frans Pop <elendil@...net.nl>, David Miller <davem@...emloft.net>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cs5520: add missing IRQ setup for the second port

On Tuesday 23 June 2009 10:42:06 Alan Cox wrote:
> On Tue, 23 Jun 2009 01:58:11 +0200
> Frans Pop <elendil@...net.nl> wrote:
> 
> > David Miller wrote:
> > > ide_pci_setup_ports() would loop over the available ports, one
> > > by one, recording IRQ numbers increasingly from the one passed
> > > in as "pciirq".
> > 
> > I looked at the commit and at the code and called functions several times 
> > (just out of curiosity), but have been completely unable to find where 
> > that increase of pciirq actually happened.
> > AFAICT ide_pci_setup_ports() just passed it on to ide_hw_configure() and 
> > all that did was 'hw->irq = irq', so AFAICT in the old case both ports 
> > would get the *same* IRQ, and not consecutive ones.
> 
> The cs5520 isn't a standard IDE controller in the first place and doesn't
> have two channels anyway. It's special as it uses non standard bar

Please note that both cs5520.c / pata_cs5520.c assume that the controller
has two ports (please verify whether they need some fixing, thanks)..
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