[PATCH] it821x: fix ide dma setup bug

Only enable dma for a valid speed setting.

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/ide/pci/it821x.c b/drivers/ide/pci/it821x.c
index 3cb04424d351..e9bad185968a 100644
--- a/drivers/ide/pci/it821x.c
+++ b/drivers/ide/pci/it821x.c
@@ -498,9 +498,14 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 {
         u8 speed        = ide_dma_speed(drive, it821x_ratemask(drive));
 
-        config_it821x_chipset_for_pio(drive, !speed);
-        it821x_tune_chipset(drive, speed);
-        return ide_dma_enable(drive);
+        if (speed) {
+                config_it821x_chipset_for_pio(drive, 0);
+                it821x_tune_chipset(drive, speed);
+
+                return ide_dma_enable(drive);
+        }
+
+        return 0;
 }
 
 /**