Commit 73f47cad authored Aug 08, 2013 by Yijing Wang Committed by Jon Mason Sep 05, 2013

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>

parent 2984411f

drivers/ntb/ntb_hw.c

+3 −4

Original line number	Diff line number	Diff line
		@@ -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;