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x86/PCI: MMCONFIG: Check earlier for MMCONFIG region at address zero 

We can check for addr being zero earlier and thus avoid the mutex_unlock()
cleanup path.

[bhelgaas: drop warning printk]
Signed-off-by: ethan.zhao <ethan.zhao@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
This commit is contained in:
ethan.zhao 2013-07-26 11:21:24 -06:00 committed by Bjorn Helgaas
parent 56039e658c
commit 07f9b61c39
1 changed files with 1 additions and 6 deletions
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7
arch/x86/pci/mmconfig-shared.c
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@ -700,7 +700,7 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
if (!(pci_probe & PCI_PROBE_MMCONF) || pci_mmcfg_arch_init_failed)
return -ENODEV;
if (start > end)
if (start > end || !addr)
return -EINVAL;
mutex_lock(&pci_mmcfg_lock);
@ -716,11 +716,6 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
return -EEXIST;
}
if (!addr) {
mutex_unlock(&pci_mmcfg_lock);
return -EINVAL;
}
rc = -EBUSY;
cfg = pci_mmconfig_alloc(seg, start, end, addr);
if (cfg == NULL) {