Attachment 297689 Details for Bug 436324 – Disable PCI IO & MEM access on a device we're probing for BAR size

[patch] Disable PCI IO & MEM access on a device we're probing for BAR size

pci-read-bases.patch (text/plain), 1.05 KB, created by David Howells on 2008-03-11 23:38:00 UTC

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Creator: David Howells

Created: 2008-03-11 23:38:00 UTC

Size: 1.05 KB

patch

obsolete

>--- linux-2.6.9/drivers/pci/probe.c.orig	2008-03-11 16:54:05.000000000 -0400
>+++ linux-2.6.9/drivers/pci/probe.c	2008-03-11 16:54:18.000000000 -0400
>@@ -105,8 +105,13 @@ static void pci_read_bases(struct pci_de
> {
> 	unsigned int pos, reg, next;
> 	u32 l, sz;
>+	u16 cmd, ncmd;
> 	struct resource *res;
> 
>+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
>+	ncmd = cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
>+	pci_write_config_word(dev, PCI_COMMAND, ncmd);
>+
> 	for(pos=0; pos<howmany; pos = next) {
> 		next = pos+1;
> 		res = &dev->resource[pos];
>@@ -153,7 +158,9 @@ static void pci_read_bases(struct pci_de
> 			}
> #else
> 			if (szhi) {
>+				pci_write_config_word(dev, PCI_COMMAND, cmd);
> 				printk(KERN_ERR "PCI: Unable to handle 64-bit BAR for device %s\n", pci_name(dev));
>+				pci_write_config_word(dev, PCI_COMMAND, ncmd);
> 				res->start = 0;
> 				res->flags = 0;
> 			} else if (lhi) {
>@@ -187,6 +194,8 @@ static void pci_read_bases(struct pci_de
> 			}
> 		}
> 	}
>+
>+	pci_write_config_word(dev, PCI_COMMAND, cmd);
> }
> 
> void __devinit pci_read_bridge_bases(struct pci_bus *child)

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Attachments on bug 436324: 297689