Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=553aa7...
Commit: 553aa7659bc0e188348f64e978343ed984eb6e56
Parent: be8cbcd8896670a01ead7a29e33ffe29604ed734
Author: Benjamin Herrenschmidt <benh@kernel.crashing.org>
AuthorDate: Thu Dec 20 14:55:05 2007 +1100
Committer: Paul Mackerras <paulus@samba.org>
CommitDate: Thu Dec 20 16:18:16 2007 +1100
[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>
---
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 1037b3a..88838b0 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;
-
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