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authorYinghai Lu <yinghai@kernel.org>2009-06-03 00:13:13 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-06-04 11:31:13 +0100
commit75e613cdc7bb2ba3795b1bc3ddf19476c767ba68 (patch)
tree14864c1ad72554fa1061dbefd2e97b549d0a2507
parentf79b1b146b52765ee38bfb91bb14eb850fa98017 (diff)
x86/pci: fix mmconfig detection with 32bit near 4g
Pascal reported and bisected a commit: | x86/PCI: don't call e820_all_mapped with -1 in the mmconfig case which broke one system system. ACPI: Using IOAPIC for interrupt routing PCI: MCFG configuration 0: base f0000000 segment 0 buses 0 - 255 PCI: MCFG area at f0000000 reserved in ACPI motherboard resources PCI: Using MMCONFIG for extended config space it didn't have PCI: updated MCFG configuration 0: base f0000000 segment 0 buses 0 - 63 anymore, and try to use 0xf000000 - 0xffffffff for mmconfig For 32bit, mcfg_res->end could be 32bit only (if 64 resources aren't used) So use end - 1 to pass the value in mcfg->end to avoid overflow. We don't need to worry about the e820 path, they are always 64 bit. Reported-by: Pascal Terjan <pterjan@mandriva.com> Bisected-by: Pascal Terjan <pterjan@mandriva.com> Tested-by: Pascal Terjan <pterjan@mandriva.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: stable@kernel.org Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--arch/x86/pci/mmconfig-shared.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 5fa10bb9604..8766b0e216c 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -375,7 +375,7 @@ static acpi_status __init check_mcfg_resource(struct acpi_resource *res,
if (!fixmem32)
return AE_OK;
if ((mcfg_res->start >= fixmem32->address) &&
- (mcfg_res->end <= (fixmem32->address +
+ (mcfg_res->end < (fixmem32->address +
fixmem32->address_length))) {
mcfg_res->flags = 1;
return AE_CTRL_TERMINATE;
@@ -392,7 +392,7 @@ static acpi_status __init check_mcfg_resource(struct acpi_resource *res,
return AE_OK;
if ((mcfg_res->start >= address.minimum) &&
- (mcfg_res->end <= (address.minimum + address.address_length))) {
+ (mcfg_res->end < (address.minimum + address.address_length))) {
mcfg_res->flags = 1;
return AE_CTRL_TERMINATE;
}
@@ -418,7 +418,7 @@ static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used)
struct resource mcfg_res;
mcfg_res.start = start;
- mcfg_res.end = end;
+ mcfg_res.end = end - 1;
mcfg_res.flags = 0;
acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL);