netxen: cache msi register offset

Store msi target status register offset in adapter struct.
This avoids contention on msi_tgt_status table from interrupt
hadlers of different pci function.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h
index 9350c8663fd..ab11c2b3f0f 100644
--- a/drivers/net/netxen/netxen_nic.h
+++ b/drivers/net/netxen/netxen_nic.h
@@ -1257,6 +1257,9 @@ struct netxen_adapter {
         u32 irq;
         u32 temp;
 
+        u32 msi_tgt_status;
+        u32 resv4;
+
         struct netxen_adapter_stats stats;
 
         struct netxen_recv_context recv_ctx;
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 83dadfd78c3..edb4bcda71e 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -525,6 +525,8 @@ netxen_setup_intr(struct netxen_adapter *adapter)
 request_msi:
                 if (use_msi && !pci_enable_msi(pdev)) {
                         adapter->flags |= NETXEN_NIC_MSI_ENABLED;
+                        adapter->msi_tgt_status =
+                                msi_tgt_status[adapter->ahw.pci_func];
                         dev_info(&pdev->dev, "using msi interrupts\n");
                 } else
                         dev_info(&pdev->dev, "using legacy interrupts\n");
@@ -1701,7 +1703,7 @@ static irqreturn_t netxen_msi_intr(int irq, void *data)
 
         /* clear interrupt */
         adapter->pci_write_immediate(adapter,
-                        msi_tgt_status[adapter->ahw.pci_func], 0xffffffff);
+                        adapter->msi_tgt_status, 0xffffffff);
 
         napi_schedule(&sds_ring->napi);
         return IRQ_HANDLED;