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ntb: clean up unnecessary MSI/MSI-X capability find 

PCI core will initialize device MSI/MSI-X capability in
pci_msi_init_pci_dev(). So device driver should use
pci_dev->msi_cap/msix_cap to determine whether the device
support MSI/MSI-X instead of using
pci_find_capability(pci_dev, PCI_CAP_ID_MSI/MSIX).
Access to PCIe device config space again will consume more time.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jon Mason <jon.mason@intel.com>
This commit is contained in:
Yijing Wang 2013-08-08 21:09:34 +08:00 committed by Jon Mason
parent 2984411f1a
commit 73f47cadfe
1 changed files with 3 additions and 4 deletions
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7
drivers/ntb/ntb_hw.c
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@ -1031,16 +1031,15 @@ static int ntb_setup_msix(struct ntb_device *ndev)
struct pci_dev *pdev = ndev->pdev;
struct msix_entry *msix;
int msix_entries;
int rc, i, pos;
int rc, i;
u16 val;
pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
if (!pos) {
if (!pdev->msix_cap) {
rc = -EIO;
goto err;
}
rc = pci_read_config_word(pdev, pos + PCI_MSIX_FLAGS, &val);
rc = pci_read_config_word(pdev, pdev->msix_cap + PCI_MSIX_FLAGS, &val);
if (rc)
goto err;