PCI/MSI: skip calling pci_find_capability from msi_set_mask_bits

The position of MSI capability is already cached in the msi_desc when
we enter the msi_set_mask_bits().  Use it instead.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 8c61304cbb37..ccb1974464fb 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -70,12 +70,10 @@ arch_teardown_msi_irqs(struct pci_dev *dev)
         }
 }
 
-static void msi_set_enable(struct pci_dev *dev, int enable)
+static void __msi_set_enable(struct pci_dev *dev, int pos, int enable)
 {
-        int pos;
         u16 control;
 
-        pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
         if (pos) {
                 pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
                 control &= ~PCI_MSI_FLAGS_ENABLE;
@@ -85,6 +83,11 @@ static void msi_set_enable(struct pci_dev *dev, int enable)
         }
 }
 
+static void msi_set_enable(struct pci_dev *dev, int enable)
+{
+        __msi_set_enable(dev, pci_find_capability(dev, PCI_CAP_ID_MSI), enable);
+}
+
 static void msix_set_enable(struct pci_dev *dev, int enable)
 {
         int pos;
@@ -141,7 +144,8 @@ static void msi_set_mask_bits(unsigned int irq, u32 mask, u32 flag)
                         mask_bits |= flag & mask;
                         pci_write_config_dword(entry->dev, pos, mask_bits);
                 } else {
-                        msi_set_enable(entry->dev, !flag);
+                        __msi_set_enable(entry->dev, entry->msi_attrib.pos,
+                                         !flag);
                 }
                 break;
         case PCI_CAP_ID_MSIX: