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PCI: Simplify config space size computation

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Restructure the logic so we return the config space size as soon as we know
it.  This reduces indentation, removes negations, and removes gotos.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2015-12-07 18:21:10 -06:00
parent 9f33a2ae59
commit 8e5a395a04
1 changed files with 10 additions and 15 deletions
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25
drivers/pci/probe.c
View file

@ -1107,14 +1107,11 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev)
int pos = PCI_CFG_SPACE_SIZE;
if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
goto fail;
return PCI_CFG_SPACE_SIZE;
if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
goto fail;
return PCI_CFG_SPACE_SIZE;
return PCI_CFG_SPACE_EXP_SIZE;
fail:
return PCI_CFG_SPACE_SIZE;
}
int pci_cfg_space_size(struct pci_dev *dev)
@ -1127,19 +1124,17 @@ int pci_cfg_space_size(struct pci_dev *dev)
if (class == PCI_CLASS_BRIDGE_HOST)
return pci_cfg_space_size_ext(dev);
if (!pci_is_pcie(dev)) {
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!pos)
goto fail;
if (pci_is_pcie(dev))
return pci_cfg_space_size_ext(dev);
pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
goto fail;
}
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!pos)
return PCI_CFG_SPACE_SIZE;
return pci_cfg_space_size_ext(dev);
pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
if (status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))
return pci_cfg_space_size_ext(dev);
fail:
return PCI_CFG_SPACE_SIZE;
}