linux-kernel - Re: [REGRESSSION 2.6.37-rc2][PATCH] pci: Fix mmap address check in pci_mmap

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Date:	Tue, 16 Nov 2010 11:03:58 +0100
From:	Martin Wilck <martin.wilck@...fujitsu.com>
To:	"djwong@...ibm.com" <djwong@...ibm.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [REGRESSSION 2.6.37-rc2][PATCH] pci: Fix mmap address check in
 pci_mmap_fits

Hi Darrick,

> I think what we want here is for pci_start to be 0 when mmap_api ==
> PCI_MMAP_PROCFS.  The following patch makes that change, after which the Matrox
> and Mach64 X drivers work again.

Of course. I made a stupid mistake when I introduced the enum :-( Thanks 
for spotting and fixing it so quickly.

Jesse, please apply Darrick's fix.

Martin

> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 95712a3..63d5042 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -715,7 +715,7 @@ int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
>   	nr = (vma->vm_end - vma->vm_start)>>  PAGE_SHIFT;
>   	start = vma->vm_pgoff;
>   	size = ((pci_resource_len(pdev, resno) - 1)>>  PAGE_SHIFT) + 1;
> -	pci_start = (mmap_api == PCI_MMAP_SYSFS) ?
> +	pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
>   			pci_resource_start(pdev, resno)>>  PAGE_SHIFT : 0;
>   	if (start>= pci_start&&  start<  pci_start + size&&
>   			start + nr<= pci_start + size)

-- 
Dr. Martin Wilck
PRIMERGY System Software Engineer
x86 Server Engineering

FUJITSU
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