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[POWERPC] Disable PCI IO/Mem on a device when resources can't be allocated

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This patch changes the PowerPC PCI code to disable IO and/or Memory
decoding on a PCI device when a resource of that type failed to be
allocated.  This is done to avoid having unallocated dangling BARs
enabled that might try to decode on top of other devices.

If a proper resource is assigned later on, then pci_enable_device()
will take care of re-enabling decoding.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2007-12-20 14:55:05 +11:00 committed by Paul Mackerras
parent be8cbcd889
commit 553aa7659b
1 changed files with 10 additions and 3 deletions
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13
arch/powerpc/kernel/pci-common.c
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@ -1034,7 +1034,7 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
}
}
static inline void __devinit alloc_resource(struct pci_dev *dev, int idx)
static inline int __devinit alloc_resource(struct pci_dev *dev, int idx)
{
struct resource *pr, *r = &dev->resource[idx];
@ -1058,7 +1058,10 @@ static inline void __devinit alloc_resource(struct pci_dev *dev, int idx)
r->flags |= IORESOURCE_UNSET;
r->end -= r->start;
r->start = 0;
return -EBUSY;
}
return 0;
}
static void __init pcibios_allocate_resources(int pass)
@ -1080,8 +1083,12 @@ static void __init pcibios_allocate_resources(int pass)
disabled = !(command & PCI_COMMAND_IO);
else
disabled = !(command & PCI_COMMAND_MEMORY);
if (pass == disabled)
alloc_resource(dev, idx);
if (pass == disabled && alloc_resource(dev, idx)) {
command &= ~(r->flags & (IORESOURCE_IO |
IORESOURCE_MEM));
pci_write_config_word(dev,
PCI_COMMAND, command);
}
}
if (pass)
continue;