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vxge: remove unnecessary reads of PCI_CAP_ID_EXP

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The PCIE capability offset is saved during PCI bus walking.  It will
remove an unnecessary search in the PCI configuration space if this
value is referenced instead of reacquiring it.

Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Mason 2011-06-27 07:48:11 +00:00 committed by David S. Miller
parent 1a10ccae90
commit 95cab7386b
1 changed files with 5 additions and 8 deletions
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13
drivers/net/vxge/vxge-config.c
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@ -753,12 +753,11 @@ static void __vxge_hw_device_host_info_get(struct __vxge_hw_device *hldev)
static enum vxge_hw_status
__vxge_hw_verify_pci_e_info(struct __vxge_hw_device *hldev)
{
int exp_cap;
struct pci_dev *dev = hldev->pdev;
u16 lnk;
/* Get the negotiated link width and speed from PCI config space */
exp_cap = pci_find_capability(hldev->pdev, PCI_CAP_ID_EXP);
pci_read_config_word(hldev->pdev, exp_cap + PCI_EXP_LNKSTA, &lnk);
pci_read_config_word(dev, dev->pcie_cap + PCI_EXP_LNKSTA, &lnk);
if ((lnk & PCI_EXP_LNKSTA_CLS) != 1)
return VXGE_HW_ERR_INVALID_PCI_INFO;
@ -1982,13 +1981,11 @@ exit:
u16 vxge_hw_device_link_width_get(struct __vxge_hw_device *hldev)
{
int link_width, exp_cap;
struct pci_dev *dev = hldev->pdev;
u16 lnk;
exp_cap = pci_find_capability(hldev->pdev, PCI_CAP_ID_EXP);
pci_read_config_word(hldev->pdev, exp_cap + PCI_EXP_LNKSTA, &lnk);
link_width = (lnk & VXGE_HW_PCI_EXP_LNKCAP_LNK_WIDTH) >> 4;
return link_width;
pci_read_config_word(dev, dev->pcie_cap + PCI_EXP_LNKSTA, &lnk);
return (lnk & VXGE_HW_PCI_EXP_LNKCAP_LNK_WIDTH) >> 4;
}
/*