[SCSI] megaraid: fix MMIO casts

megaraid's MMIO RD*/WR* macros directly call readl() and writel() with
an 'unsigned long' argument.  This throws a warning, but is otherwise OK
because the 'unsigned long' is really the result of ioremap().  This
setup is also OK because the variable can hold an ioremap cookie /or/ a
PCI I/O port (PIO).

However, to fix the warning thrown when readl() and writel() are passed
an unsigned long cookie, I introduce 'void __iomem *mmio_base', holding
the same value as 'base'.  This will silence the warnings, and also
cause an oops whenever these MMIO-only functions are ever accidentally
passed an I/O address.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 10 insertions, 6 deletions

diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 86099fde1b2a..77d9d3804ccf 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -73,10 +73,10 @@ static unsigned short int max_mbox_busy_wait = MBOX_BUSY_WAIT;
 module_param(max_mbox_busy_wait, ushort, 0);
 MODULE_PARM_DESC(max_mbox_busy_wait, "Maximum wait for mailbox in microseconds if busy (default=MBOX_BUSY_WAIT=10)");
 
-#define RDINDOOR(adapter)               readl((adapter)->base + 0x20)
-#define RDOUTDOOR(adapter)              readl((adapter)->base + 0x2C)
-#define WRINDOOR(adapter,value)         writel(value, (adapter)->base + 0x20)
-#define WROUTDOOR(adapter,value)        writel(value, (adapter)->base + 0x2C)
+#define RDINDOOR(adapter)       readl((adapter)->mmio_base + 0x20)
+#define RDOUTDOOR(adapter)      readl((adapter)->mmio_base + 0x2C)
+#define WRINDOOR(adapter,value)  writel(value, (adapter)->mmio_base + 0x20)
+#define WROUTDOOR(adapter,value) writel(value, (adapter)->mmio_base + 0x2C)
 
 /*
  * Global variables
@@ -1386,7 +1386,8 @@ megaraid_isr_memmapped(int irq, void *devp)
 
                 handled = 1;
 
-                while( RDINDOOR(adapter) & 0x02 ) cpu_relax();
+                while( RDINDOOR(adapter) & 0x02 )
+                        cpu_relax();
 
                 mega_cmd_done(adapter, completed, nstatus, status);
 
@@ -4668,6 +4669,8 @@ megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
                 host->host_no, mega_baseport, irq);
 
         adapter->base = mega_baseport;
+        if (flag & BOARD_MEMMAP)
+                adapter->mmio_base = (void __iomem *) mega_baseport;
 
         INIT_LIST_HEAD(&adapter->free_list);
         INIT_LIST_HEAD(&adapter->pending_list);
diff --git a/drivers/scsi/megaraid.h b/drivers/scsi/megaraid.h
index 66529f11d23c..c6e74643abe2 100644
--- a/drivers/scsi/megaraid.h
+++ b/drivers/scsi/megaraid.h
@@ -801,7 +801,8 @@ typedef struct {
                                    clustering is available */
         u32     flag;
 
-        unsigned long   base;
+        unsigned long           base;
+        void __iomem            *mmio_base;
 
         /* mbox64 with mbox not aligned on 16-byte boundry */
         mbox64_t        *una_mbox64;