From: Lennert Buytenhek Date: Sat, 16 Apr 2005 22:25:58 +0000 (-0700) Subject: [PATCH] pci enumeration on ixp2000: overflow in kernel/resource.c X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b52402c783d8c16b11f146a244bb21086a94bf84;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [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: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/resource.c b/kernel/resource.c index 35c99ac02c7c..52f696f11adf 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -266,7 +266,7 @@ static int find_resource(struct resource *root, struct resource *new, 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; }