[SCSI] mpt fusion: Enable MSI by default for SAS controllers

This patch modifies the driver to enable MSI by default for all SAS chips.

Signed-off-by: Sathya Prakash <sathya.prakash@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 13 insertions, 5 deletions

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index c6be6eba7dc3..6ee5876d0524 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -79,7 +79,7 @@ MODULE_VERSION(my_VERSION);
 /*
  *  cmd line parameters
  */
-static int mpt_msi_enable;
+static int mpt_msi_enable = -1;
 module_param(mpt_msi_enable, int, 0);
 MODULE_PARM_DESC(mpt_msi_enable, " MSI Support Enable (default=0)");
 
@@ -1686,6 +1686,11 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
                 ioc->bus_type = SAS;
         }
 
+        if (ioc->bus_type == SAS && mpt_msi_enable == -1)
+                ioc->msi_enable = 1;
+        else
+                ioc->msi_enable = mpt_msi_enable;
+
         if (ioc->errata_flag_1064)
                 pci_disable_io_access(pdev);
 
@@ -2057,15 +2062,17 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
         if ((ret == 0) && (reason == MPT_HOSTEVENT_IOC_BRINGUP)) {
                 ioc->pci_irq = -1;
                 if (ioc->pcidev->irq) {
-                        if (mpt_msi_enable && !pci_enable_msi(ioc->pcidev))
+                        if (ioc->msi_enable && !pci_enable_msi(ioc->pcidev))
                                 printk(MYIOC_s_INFO_FMT "PCI-MSI enabled\n",
                                     ioc->name);
+                        else
+                                ioc->msi_enable = 0;
                         rc = request_irq(ioc->pcidev->irq, mpt_interrupt,
                             IRQF_SHARED, ioc->name, ioc);
                         if (rc < 0) {
                                 printk(MYIOC_s_ERR_FMT "Unable to allocate "
                                     "interrupt %d!\n", ioc->name, ioc->pcidev->irq);
-                                if (mpt_msi_enable)
+                                if (ioc->msi_enable)
                                         pci_disable_msi(ioc->pcidev);
                                 return -EBUSY;
                         }
@@ -2261,7 +2268,7 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
  out:
         if ((ret != 0) && irq_allocated) {
                 free_irq(ioc->pci_irq, ioc);
-                if (mpt_msi_enable)
+                if (ioc->msi_enable)
                         pci_disable_msi(ioc->pcidev);
         }
         return ret;
@@ -2443,7 +2450,7 @@ mpt_adapter_dispose(MPT_ADAPTER *ioc)
 
         if (ioc->pci_irq != -1) {
                 free_irq(ioc->pci_irq, ioc);
-                if (mpt_msi_enable)
+                if (ioc->msi_enable)
                         pci_disable_msi(ioc->pcidev);
                 ioc->pci_irq = -1;
         }
diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h
index caadc68c3000..50c0c173e24e 100644
--- a/drivers/message/fusion/mptbase.h
+++ b/drivers/message/fusion/mptbase.h
@@ -630,6 +630,7 @@ typedef struct _MPT_ADAPTER
         int                      mtrr_reg;
         struct pci_dev          *pcidev;        /* struct pci_dev pointer */
         int                     bars;           /* bitmask of BAR's that must be configured */
+        int                     msi_enable;
         u8                      __iomem *memmap;        /* mmap address */
         struct Scsi_Host        *sh;            /* Scsi Host pointer */
         SpiCfgData              spi_data;       /* Scsi config. data */