pdc202xx_old: 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.

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

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index fbcb0bb9c956..e19a891171cb 100644
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -1,5 +1,5 @@
 /*
- *  linux/drivers/ide/pci/pdc202xx_old.c        Version 0.50    Mar 3, 2007
+ *  linux/drivers/ide/pci/pdc202xx_old.c        Version 0.51    Jul 27, 2007
  *
  *  Copyright (C) 1998-2002             Andre Hedrick <andre@linux-ide.org>
  *  Copyright (C) 2006-2007             MontaVista Software, Inc.
@@ -337,15 +337,18 @@ static void __devinit init_hwif_pdc202xx(ide_hwif_t *hwif)
 
         hwif->speedproc = &pdc202xx_tune_chipset;
 
+        hwif->err_stops_fifo = 1;
+
         hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
 
+        if (hwif->dma_base == 0)
+                return;
+
         hwif->ultra_mask = hwif->cds->udma_mask;
         hwif->mwdma_mask = 0x07;
         hwif->swdma_mask = 0x07;
         hwif->atapi_dma = 1;
 
-        hwif->err_stops_fifo = 1;
-
         hwif->ide_dma_check = &pdc202xx_config_drive_xfer_rate;
         hwif->dma_lost_irq = &pdc202xx_dma_lost_irq;
         hwif->dma_timeout = &pdc202xx_dma_timeout;