The patch intends to use cached MSI capability offset instead of
polling that from config space in pci_enable_msi_block_auto().
Signed-off-by: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx>
---
drivers/pci/msi.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 182474d..0b6b254 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -848,14 +848,13 @@ EXPORT_SYMBOL(pci_enable_msi_block);
int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec)
{
- int ret, pos, nvec;
+ int ret, nvec;
u16 msgctl;
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (!pos)
+ if (!dev->msi_cap)
return -EINVAL;
- pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
+ pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
if (maxvec)
--
1.7.5.4
--
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