sgiioc4: add missing ->dma_base check

If ->dma_base is not set (== PCI BAR4 cannot be reserved) then DMA hooks
shouldn't be initialized or bad things will happen.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index 26352626c0e8..85ffaaa39b1b 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -587,8 +587,6 @@ static void __devinit
 ide_init_sgiioc4(ide_hwif_t * hwif)
 {
         hwif->mmio = 1;
-        hwif->atapi_dma = 1;
-        hwif->mwdma_mask = 0x04;
         hwif->pio_mask = 0x00;
         hwif->set_pio_mode = NULL; /* Sets timing for PIO mode */
         hwif->set_dma_mode = &sgiioc4_set_dma_mode;
@@ -602,6 +600,14 @@ ide_init_sgiioc4(ide_hwif_t * hwif)
         hwif->quirkproc = NULL;
         hwif->busproc = NULL;
 
+        hwif->INB = &sgiioc4_INB;
+
+        if (hwif->dma_base == 0)
+                return;
+
+        hwif->atapi_dma = 1;
+        hwif->mwdma_mask = 0x04;
+
         hwif->dma_setup = &sgiioc4_ide_dma_setup;
         hwif->dma_start = &sgiioc4_ide_dma_start;
         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
@@ -613,8 +619,6 @@ ide_init_sgiioc4(ide_hwif_t * hwif)
         hwif->dma_host_off = &sgiioc4_dma_host_off;
         hwif->dma_lost_irq = &sgiioc4_dma_lost_irq;
         hwif->dma_timeout = &ide_dma_timeout;
-
-        hwif->INB = &sgiioc4_INB;
 }
 
 static int __devinit
@@ -684,8 +688,6 @@ sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
         /* Initializing chipset IRQ Registers */
         writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
 
-        ide_init_sgiioc4(hwif);
-
         hwif->autodma = 0;
 
         if (dma_base && ide_dma_sgiioc4(hwif, dma_base) == 0) {
@@ -695,6 +697,8 @@ sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
                 printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
                                  hwif->name, DRV_NAME);
 
+        ide_init_sgiioc4(hwif);
+
         if (probe_hwif_init(hwif))
                 return -EIO;