sgiioc4: fix sgiioc4_ide_dma_check() to enable/disable DMA properly

* use sgiioc4_ide_dma_{on,off_quietly}() instead of changing
  drive->using_dma directly
* fix warning message
* add FIXME
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/sgiioc4.c

@@ -274,21 +274,6 @@ sgiioc4_ide_dma_end(ide_drive_t * drive)
 	return dma_stat;
 }
 
-static int
-sgiioc4_ide_dma_check(ide_drive_t * drive)
-{
-	if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
-		printk(KERN_INFO
-		       "Couldnot set %s in Multimode-2 DMA mode | "
-			   "Drive %s using PIO instead\n",
-		       drive->name, drive->name);
-		drive->using_dma = 0;
-	} else
-		drive->using_dma = 1;
-
-	return 0;
-}
-
 static int
 sgiioc4_ide_dma_on(ide_drive_t * drive)
 {
@@ -305,6 +290,17 @@ sgiioc4_ide_dma_off_quietly(ide_drive_t * drive)
 	return HWIF(drive)->ide_dma_host_off(drive);
 }
 
+static int sgiioc4_ide_dma_check(ide_drive_t *drive)
+{
+	/* FIXME: check for available DMA modes */
+	if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
+		printk(KERN_WARNING "%s: couldn't set MWDMA2 mode, "
+				    "using PIO instead\n", drive->name);
+		return sgiioc4_ide_dma_off_quietly(drive);
+	} else
+		return sgiioc4_ide_dma_on(drive);
+}
+
 /* returns 1 if dma irq issued, 0 otherwise */
 static int
 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)