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authorYinghai Lu <yinghai@kernel.org>2010-01-22 01:02:23 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-22 16:17:21 -0800
commitd65245c3297ac63abc51a976d92f45f2195d2854 (patch)
tree97dbc9a714ef03810609f2d5faca1f56fd872547 /drivers/pci
parentcd81e1ea1a4cda94aa5f3e942301cf0da497c262 (diff)
PCI: don't shrink bridge resources
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/setup-bus.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 7e87ea8f3200..f560814c557c 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -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;