Commit b52402c7 authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by Linus Torvalds

[PATCH] pci enumeration on ixp2000: overflow in kernel/resource.c

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.

(akpm: pls. double-check)
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent fe4b334f
...@@ -266,7 +266,7 @@ static int find_resource(struct resource *root, struct resource *new, ...@@ -266,7 +266,7 @@ static int find_resource(struct resource *root, struct resource *new,
new->start = (new->start + align - 1) & ~(align - 1); new->start = (new->start + align - 1) & ~(align - 1);
if (alignf) if (alignf)
alignf(alignf_data, new, size, align); 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; new->end = new->start + size - 1;
return 0; return 0;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment