sc1200: fix ->dma_base equal zero handling

Set hwif->atapi_dma/{ultra,mwdma}_mask and drive->autodma after checking that
->dma_base exists.  If ->dma_base is not set (== PCI BAR4 cannot be reserved)
then DMA hooks shouldn't be initialized or bad things will happen.

OTOH hwif->set_{pio,dma}_mode hooks should be set even if hwif->dma_base == 0.

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

1 files changed, 14 insertions, 10 deletions

diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 76f0868054a1..ee0e3f554d9a 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -378,16 +378,20 @@ static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
         if (hwif->mate)
                 hwif->serialized = hwif->mate->serialized = 1;
         hwif->autodma = 0;
-        if (hwif->dma_base) {
-                hwif->udma_filter = sc1200_udma_filter;
-                hwif->ide_dma_check = &sc1200_config_dma;
-                hwif->ide_dma_end   = &sc1200_ide_dma_end;
-                if (!noautodma)
-                        hwif->autodma = 1;
-
-                hwif->set_pio_mode = &sc1200_set_pio_mode;
-                hwif->set_dma_mode = &sc1200_set_dma_mode;
-        }
+
+        hwif->set_pio_mode = &sc1200_set_pio_mode;
+        hwif->set_dma_mode = &sc1200_set_dma_mode;
+
+        if (hwif->dma_base == 0)
+                return;
+
+        hwif->udma_filter = sc1200_udma_filter;
+        hwif->ide_dma_check = &sc1200_config_dma;
+        hwif->ide_dma_end   = &sc1200_ide_dma_end;
+
+        if (!noautodma)
+                hwif->autodma = 1;
+
         hwif->atapi_dma = 1;
         hwif->ultra_mask = 0x07;
         hwif->mwdma_mask = 0x07;