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[PATCH] Fix restore of 64-bit PCI BAR's

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For 64-bit BAR[i] only pci_dev->resource[i] is valid, ->resource[i+1]
slot is unused and contains zeroes in all fields.

So when we update a PCI BAR, all we need is just to check that we're
going to update a _valid_ resource.

Also make sure to write high bits - use "x >> 16 >> 16" (rather than the
simpler ">> 32") to avoid warnings on 32-bit architectures where we're
not going to have any high bits.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ivan Kokshaysky 2005-08-07 13:49:59 +04:00 committed by Linus Torvalds
parent 0d317fb72f
commit cf7bee5a0b
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/setup-res.c
View file

@ -33,6 +33,11 @@ pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
u32 new, check, mask;
int reg;
/* Ignore resources for unimplemented BARs and unused resource slots
for 64 bit BARs. */
if (!res->flags)
return;
pcibios_resource_to_bus(dev, &region, res);
pr_debug(" got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
@ -67,7 +72,7 @@ pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
new = 0; /* currently everyone zeros the high address */
new = region.start >> 16 >> 16;
pci_write_config_dword(dev, reg + 4, new);
pci_read_config_dword(dev, reg + 4, &check);
if (check != new) {