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 <wangyij...@huawei.com>
Cc: Jon Mason <jon.ma...@intel.com>
Cc: linux-kernel@vger.kernel.org
---
drivers/ntb/ntb_hw.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index 2dacd19..090d1b2 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -758,16 +758,15 @@ 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;
--
1.7.1
--
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