From: Lennert Buytenhek IXP2000 (ARM-based) platforms use a separate 'struct resource' for PCI MEM space. Resource allocation for PCI BARs always fails because the 'root' resource (the IXP2000 PCI MEM resource) always has the entire address space (00000000-ffffffff) free, and find_resource() calculates the size of that range as ffffffff-00000000+1=0, so all allocations fail because it thinks there is no space. Signed-off-by: Andrew Morton --- 25-akpm/kernel/resource.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-) diff -puN kernel/resource.c~pci-enumeration-on-ixp2000-overflow-in-kernel-resourcec kernel/resource.c --- 25/kernel/resource.c~pci-enumeration-on-ixp2000-overflow-in-kernel-resourcec 2005-04-10 15:07:52.000000000 -0700 +++ 25-akpm/kernel/resource.c 2005-04-10 15:07:52.000000000 -0700 @@ -266,7 +266,7 @@ static int find_resource(struct resource new->start = (new->start + align - 1) & ~(align - 1); if (alignf) alignf(alignf_data, new, size, align); - if (new->start < new->end && new->end - new->start + 1 >= size) { + if (new->start < new->end && new->end - new->start >= size - 1) { new->end = new->start + size - 1; return 0; } _