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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>
This commit is contained in:
Dhananjay Phadke 2009-05-08 22:02:27 +00:00 committed by David S. Miller
parent 61de71c67c
commit 7a2469ce4d
2 changed files with 6 additions and 1 deletions
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3
drivers/net/netxen/netxen_nic.h
View File

@ -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;

4
drivers/net/netxen/netxen_nic_main.c
View File

@ -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;