x86/PCI: MMCONFIG: reject MMCONFIG apertures at address zero

Since all MMCONFIG regions go through pci_mmconfig_add(), we can test the
address once there.  If the caller supplies an address of zero, we never
insert it in the pci_mmcfg_config[] table, so no need to test it elsewhere.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index a0cc4d2..067a2cf 100644 (file)
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -41,6 +41,9 @@ static __init struct acpi_mcfg_allocation *pci_mmconfig_add(int segment,
        int new_num = pci_mmcfg_config_num + 1;
        int i = pci_mmcfg_config_num;
 
+       if (addr == 0)
+               return NULL;
+
        new = kzalloc(sizeof(pci_mmcfg_config[0]) * new_num, GFP_KERNEL);
        if (!new)
                return NULL;
@@ -471,8 +474,7 @@ static void __init pci_mmcfg_reject_broken(int early)
        typeof(pci_mmcfg_config[0]) *cfg;
        int i;
 
-       if ((pci_mmcfg_config_num == 0) ||
-           (pci_mmcfg_config[0].address == 0))
+       if (pci_mmcfg_config_num == 0)
                return;
 
        for (i = 0; i < pci_mmcfg_config_num; i++) {
@@ -616,8 +618,7 @@ static void __init __pci_mmcfg_init(int early)
 
        pci_mmcfg_reject_broken(early);
 
-       if ((pci_mmcfg_config_num == 0) ||
-           (pci_mmcfg_config[0].address == 0))
+       if (pci_mmcfg_config_num == 0)
                return;
 
        if (pci_mmcfg_arch_init())
@@ -649,8 +650,7 @@ static int __init pci_mmcfg_late_insert_resources(void)
         */
        if ((pci_mmcfg_resources_inserted == 1) ||
            (pci_probe & PCI_PROBE_MMCONF) == 0 ||
-           (pci_mmcfg_config_num == 0) ||
-           (pci_mmcfg_config[0].address == 0))
+           (pci_mmcfg_config_num == 0))
                return 1;
 
        /*