diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2007-12-20 14:55:05 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-12-20 16:18:16 +1100 |
| commit | 553aa7659bc0e188348f64e978343ed984eb6e56 (patch) | |
| tree | 8c27968b7fa745c4bca9e573962ea6877f487014 /arch/powerpc/kernel/pci-common.c | |
| parent | be8cbcd8896670a01ead7a29e33ffe29604ed734 (diff) | |
[POWERPC] Disable PCI IO/Mem on a device when resources can't be allocated
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>
Diffstat (limited to 'arch/powerpc/kernel/pci-common.c')
| -rw-r--r-- | arch/powerpc/kernel/pci-common.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 1037b3a093ee..88838b0f8b90 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -1034,7 +1034,7 @@ clear_resource: } } -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; |