linux-kernel - Re: [PATCH 07/11] parisc: superio: do not use PCI resources before pci_enable

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Date:	Tue, 3 Aug 2010 20:35:08 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	kernel-janitors@...r.kernel.org, Kyle McMartin <kyle@...artin.ca>,
	Helge Deller <deller@....de>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Frans Pop <elendil@...net.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/11] parisc: superio: do not use PCI resources before
 pci_enable_device()

On Tue, Aug 03, 2010 at 11:11 -0500, James Bottomley wrote:
> On Tue, 2010-08-03 at 19:44 +0400, Kulikov Vasiliy wrote:
> >  drivers/parisc/superio.c |    5 +++--
> >  1 files changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/parisc/superio.c b/drivers/parisc/superio.c
> > index f7806d8..c8a36a2 100644
> > --- a/drivers/parisc/superio.c
> > +++ b/drivers/parisc/superio.c
> > @@ -169,8 +169,6 @@ superio_init(struct pci_dev *pcidev)
> >  	/* ...then properly fixup the USB to point at suckyio PIC */
> >  	sio->usb_pdev->irq = superio_fixup_irq(sio->usb_pdev);
> >  
> > -	printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i)\n",
> > -	       pci_name(pdev), pdev->irq);
> >  
> >  	pci_read_config_dword (pdev, SIO_SP1BAR, &sio->sp1_base);
> >  	sio->sp1_base &= ~1;
> > @@ -204,6 +202,9 @@ superio_init(struct pci_dev *pcidev)
> >  	ret = pci_enable_device(pdev);
> >  	BUG_ON(ret < 0);	/* not too much we can do about this... */
> >  
> > +	printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i)\n",
> > +	       pci_name(pdev), pdev->irq);
> > +
> >  	/*
> >  	 * Next project is programming the onboard interrupt controllers.
> >  	 * PDC hasn't done this for us, since it's using polled I/O.
> 
> This really makes no sense; we want the information printed before we
> start all the discovery prints, not after.

Right, I missed it.

> I assume lots of
> initialisers want this too, so it looks particularly silly not to have
> pci_name() returning the correct value until enable time.
> 
> If this is just the name initially assigned may change, this definitely
> isn't true for parisc, and even for other things, it would be better to
> print something than nothing.

Not name, but pdev-irq. I was not searching for pci_name() as you can
see in coccinelle script :)

As it is only printing wrong value, the worst case is fooling user that
reads logs.


Is it OK to move pci_enable_device() just before this printk()?

> 
> James
> 
> 
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