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PCI: don't shrink bridge resources

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When clearing leaf bridge resources, trying to get a big enough one, we
could shrink the bridge if there is no resource under it.  Confirm
against the old resource side to make sure we're increasing the
allocation.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yinghai Lu 2010-01-22 01:02:23 -08:00 committed by Jesse Barnes
parent cd81e1ea1a
commit d65245c329
1 changed files with 12 additions and 2 deletions
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14
drivers/pci/setup-bus.c
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@ -382,7 +382,7 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
{
struct pci_dev *dev;
struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
unsigned long size = 0, size1 = 0;
unsigned long size = 0, size1 = 0, old_size;
if (!b_res)
return;
@ -407,12 +407,17 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
}
if (size < min_size)
size = min_size;
old_size = resource_size(b_res);
if (old_size == 1)
old_size = 0;
/* To be fixed in 2.5: we should have sort of HAVE_ISA
flag in the struct pci_bus. */
#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
size = (size & 0xff) + ((size & ~0xffUL) << 2);
#endif
size = ALIGN(size + size1, 4096);
if (size < old_size)
size = old_size;
if (!size) {
if (b_res->start || b_res->end)
dev_info(&bus->self->dev, "disabling bridge window "
@ -433,7 +438,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
unsigned long type, resource_size_t min_size)
{
struct pci_dev *dev;
resource_size_t min_align, align, size;
resource_size_t min_align, align, size, old_size;
resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
int order, max_order;
struct resource *b_res = find_free_bus_resource(bus, type);
@ -483,6 +488,11 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
}
if (size < min_size)
size = min_size;
old_size = resource_size(b_res);
if (old_size == 1)
old_size = 0;
if (size < old_size)
size = old_size;
align = 0;
min_align = 0;