linux-kernel - Re: [patch] pci: pci_enable_device

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Date:	Sat, 02 Feb 2008 10:01:09 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz,
	pcihpd-discuss@...ts.sourceforge.net,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [patch] pci: pci_enable_device_bars() fix


On Sat, 2008-02-02 at 10:51 -0500, Jeff Garzik wrote:
> Ingo Molnar wrote:
> > ===================================================================
> > --- linux.orig/drivers/scsi/lpfc/lpfc_init.c
> > +++ linux/drivers/scsi/lpfc/lpfc_init.c
> > @@ -1894,7 +1894,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev,
> >  	uint16_t iotag;
> >  	int bars = pci_select_bars(pdev, IORESOURCE_MEM);
> >  
> > -	if (pci_enable_device_bars(pdev, bars))
> > +	if (pci_enable_device_io(pdev))
> >  		goto out;
> 
> Look at the line right above it...  AFAICS you want 
> pci_enable_device_mem(), if the mask is selecting IORESOURCE_MEM BARs.
> 
> Also a CC to linux-scsi and the driver author would be nice, as they are 
> the ones with hardware and can verify.
> 
> This set of changes seemed like 50% guesswork to me, without consulting 
> the authors :(  And unlike many changes, you actually have to know the 
> hardware [or get clues from surrounding code] to make the change.

Jeff is right, this fix is wrong.

The correct fix is here:

http://marc.info/?l=linux-scsi&m=120196768605031

Ingo, could you please cc linux-scsi on your mails ... it would have
been a complete disaster to have this incorrect patch go in.

James


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