lkml.org 
[lkml]   [2013]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 10/16] ntb: clean up unnecessary MSI/MSI-X capability find
Date
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>
Cc: Jon Mason <jon.mason@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



\
 
 \ /
  Last update: 2013-08-08 15:21    [W:0.074 / U:0.640 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site