sgiioc4: kill duplicate ioremap()

By the time ide_dma_sgiioc4() gets called, sgiioc4_ide_setup_pci_device() will
have called ioremap() on the whole BAR0 region, so calling ioremap() on the DMA
registers means wasting a page. Replace this call by a mere address calculation,
based on the fact that IRQ registers (pointed to by 'hwif->io_ports.irq_addr')
are situated at offset 0 from BAR0.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: jeremy@sgi.com
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 2 insertions, 12 deletions

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index f6c5ba07be71..8af9b23499fd 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -320,7 +320,6 @@ ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
 {
         struct pci_dev *dev = to_pci_dev(hwif->dev);
         unsigned long dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;
-        void __iomem *virt_dma_base;
         int num_ports = sizeof (ioc4_dma_regs_t);
         void *pad;
 
@@ -333,14 +332,8 @@ ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
                 return -1;
         }
 
-        virt_dma_base = ioremap(dma_base, num_ports);
-        if (virt_dma_base == NULL) {
-                printk(KERN_ERR "%s(%s) -- ERROR: unable to map addresses "
-                       "0x%lx to 0x%lx\n", __func__, hwif->name,
-                       dma_base, dma_base + num_ports - 1);
-                goto dma_remap_failure;
-        }
-        hwif->dma_base = (unsigned long) virt_dma_base;
+        hwif->dma_base = (unsigned long)hwif->io_ports.irq_addr +
+                         IOC4_DMA_OFFSET;
 
         hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 
@@ -364,9 +357,6 @@ ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
         printk(KERN_INFO "%s: changing from DMA to PIO mode", hwif->name);
 
 dma_pci_alloc_failure:
-        iounmap(virt_dma_base);
-
-dma_remap_failure:
         release_mem_region(dma_base, num_ports);
 
         return -1;