[086/205] x86, Calgary: Limit the max PHB number to 256

From: Greg KH
Date: Fri Jul 30 2010 - 13:56:32 EST


2.6.34-stable review patch. If anyone has any objections, please let us know.

------------------

From: Darrick J. Wong <djwong@xxxxxxxxxx>

commit d596043d71ff0d7b3d0bead19b1d68c55f003093 upstream.

The x3950 family can have as many as 256 PCI buses in a single system, so
change the limits to the maximum. Since there can only be 256 PCI buses in one
domain, we no longer need the BUG_ON check.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
LKML-Reference: <20100701004519.GQ15515@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
arch/x86/kernel/pci-calgary_64.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -110,7 +110,7 @@ int use_calgary __read_mostly = 0;
* x3950 (PCIE): 8 chassis, 32 PHBs per chassis = 256
* x3950 (PCIX): 8 chassis, 16 PHBs per chassis = 128
*/
-#define MAX_PHB_BUS_NUM 384
+#define MAX_PHB_BUS_NUM 256

#define PHBS_PER_CALGARY 4

@@ -1056,8 +1056,6 @@ static int __init calgary_init_one(struc
struct iommu_table *tbl;
int ret;

- BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
-
bbar = busno_to_bbar(dev->bus->number);
ret = calgary_setup_tar(dev, bbar);
if (ret)


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