[SCSI] fusion: add MSI support

On Mon, Jan 16, 2006 at 06:53:24PM -0700, Moore, Eric wrote:
> Adding MSI support, and command line for enabling
> it.  By default, the command line option has MSI disabled.

mpt_msi_enable is initialized to 0 implicitly, no need to do that.  Also
replace if (mpt_msi_enable == 1) tests with just if (mpt_msi_enable).

Updated patch below:

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 2ef64b9..e352b00 100644 (file)
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -81,6 +81,10 @@ MODULE_LICENSE("GPL");
 /*
  *  cmd line parameters
  */
+static int mpt_msi_enable;
+module_param(mpt_msi_enable, int, 0);
+MODULE_PARM_DESC(mpt_msi_enable, " MSI Support Enable (default=0)");
+
 #ifdef MFCNT
 static int mfcounter = 0;
 #define PRINT_MF_COUNT 20000
@@ -1444,6 +1448,9 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 
        ioc->pci_irq = -1;
        if (pdev->irq) {
+               if (mpt_msi_enable && !pci_enable_msi(pdev))
+                       printk(MYIOC_s_INFO_FMT "PCI-MSI enabled\n", ioc->name);
+
                r = request_irq(pdev->irq, mpt_interrupt, SA_SHIRQ, ioc->name, ioc);
 
                if (r < 0) {
@@ -1483,6 +1490,8 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 
                list_del(&ioc->list);
                free_irq(ioc->pci_irq, ioc);
+               if (mpt_msi_enable)
+                       pci_disable_msi(pdev);
                iounmap(mem);
                kfree(ioc);
                pci_set_drvdata(pdev, NULL);
@@ -2136,6 +2145,8 @@ mpt_adapter_dispose(MPT_ADAPTER *ioc)
 
        if (ioc->pci_irq != -1) {
                free_irq(ioc->pci_irq, ioc);
+               if (mpt_msi_enable)
+                       pci_disable_msi(ioc->pcidev);
                ioc->pci_irq = -1;
        }