linux-kernel - Re: PCI: Fix boot-time hang on G31/G33 PC

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Message-ID: <20070926211816.GA9916@kroah.com>
Date:	Wed, 26 Sep 2007 14:18:16 -0700
From:	Greg KH <greg@...ah.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	Robert Hancock <hancockr@...w.ca>,
	Jesse Barnes <jesse.barnes@...el.com>
Subject: Re: PCI: Fix boot-time hang on G31/G33 PC

Due to the issues surrounding this patch, I'm dropping it from my repo.

thanks,

greg k-h


On Sat, Aug 25, 2007 at 07:55:56PM -0600, Matthew Wilcox wrote:
> 
> 
> This patch, loosely based on a patch from Robert Hancock, which was in
> turn based on a patch from Jesse Barnes, fixes a boot-time hang on my
> shiny new PC.  The 'conflict' mentioned in the patch in my case happens
> to be between mmconfig and the graphics card, but it could easily be
> between any pair of devices if they are left enabled by the BIOS and
> mappen in the wrong place.
> 
> Signed-off-by: Matthew Wilcox <matthew@....cx>
> Acked-by: Robert Hancock <hancockr@...w.ca>
> Acked-by: Jesse Barnes <jesse.barnes@...el.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> ---
>  drivers/pci/probe.c |   18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -180,11 +180,26 @@ static inline int is_64bit_memory(u32 ma
>  	return 0;
>  }
>  
> +/*
> + * Sizing PCI BARs requires us to disable decoding, otherwise we may run
> + * into conflicts with other devices while trying to size the BAR.  Normally
> + * this isn't a problem, but it happens on some machines normally, and can
> + * happen on others during PCI device hotplug.  Don't disable BARs for host
> + * bridges, though.  Some of them do silly things like disable accesses to
> + * RAM from the CPU
> + */
>  static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
>  {
>  	unsigned int pos, reg, next;
>  	u32 l, sz;
>  	struct resource *res;
> +	u16 orig_cmd;
> +
> +	if ((dev->class >> 8) != PCI_CLASS_BRIDGE_HOST) {
> +		pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
> +		pci_write_config_word(dev, PCI_COMMAND,
> +			orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
> +	}
>  
>  	for(pos=0; pos<howmany; pos = next) {
>  		u64 l64;
> @@ -283,6 +298,9 @@ static void pci_read_bases(struct pci_de
>  			}
>  		}
>  	}
> +
> +	if ((dev->class >> 8) != PCI_CLASS_BRIDGE_HOST)
> +		pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
>  }
>  
>  void pci_read_bridge_bases(struct pci_bus *child)
-
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