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PCI/VFIO: use pcie_flags_reg instead of access PCI-E Capabilities Register 

Currently, we use pcie_flags_reg to cache PCI-E Capabilities Register,
because PCI-E Capabilities Register bits are almost read-only. This patch
use pcie_caps_reg() instead of another access PCI-E Capabilities Register.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yijing Wang 2013-04-15 08:45:10 -06:00 committed by Alex Williamson
parent a7d1ea1c11
commit aa2cba51a0
1 changed files with 1 additions and 5 deletions
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6
drivers/vfio/pci/vfio_pci_config.c
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@ -1037,13 +1037,9 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
return byte;
case PCI_CAP_ID_EXP:
/* length based on version */
ret = pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &word);
if (ret)
return pcibios_err_to_errno(ret);
vdev->extended_caps = true;
if ((word & PCI_EXP_FLAGS_VERS) == 1)
if ((pcie_caps_reg(pdev) & PCI_EXP_FLAGS_VERS) == 1)
return PCI_CAP_EXP_ENDPOINT_SIZEOF_V1;
else
return PCI_CAP_EXP_ENDPOINT_SIZEOF_V2;