Commit cd81e1ea authored by Yinghai Lu's avatar Yinghai Lu Committed by Jesse Barnes
Browse files

PCI: reject mmio ranges starting at 0 on pci_bridge read



We already track unassigned resources in struct resource, and this
prevents us from overwriting resource flags and info in the unassigned
case.
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 568ddef8
......@@ -316,13 +316,17 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
limit |= (io_limit_hi << 16);
}
if (base <= limit) {
if (base && base <= limit) {
res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
if (!res->start)
res->start = base;
if (!res->end)
res->end = limit + 0xfff;
dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
} else {
dev_printk(KERN_DEBUG, &dev->dev,
" bridge window [io %04lx - %04lx] reg reading\n",
base, limit);
}
res = child->resource[1];
......@@ -330,11 +334,15 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
if (base <= limit) {
if (base && base <= limit) {
res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
res->start = base;
res->end = limit + 0xfffff;
dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
} else {
dev_printk(KERN_DEBUG, &dev->dev,
" bridge window [mem 0x%08lx - 0x%08lx] reg reading\n",
base, limit + 0xfffff);
}
res = child->resource[2];
......@@ -366,7 +374,7 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
#endif
}
}
if (base <= limit) {
if (base && base <= limit) {
res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (res->flags & PCI_PREF_RANGE_TYPE_64)
......@@ -374,6 +382,10 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
res->start = base;
res->end = limit + 0xfffff;
dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
} else {
dev_printk(KERN_DEBUG, &dev->dev,
" bridge window [mem 0x%08lx - %08lx pref] reg reading\n",
base, limit + 0xfffff);
}
}
......
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