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>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index b717922d6240..1cb6e51e6bda 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -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;