[ARM] Ensure sl82c105 IDE interfaces are serialized when using DMA

We don't want to reset the DMA state machine while the other
channel is in use.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/ide/pci/sl82c105.c b/drivers/ide/pci/sl82c105.c
index 6466db5..8a5c7b2 100644 (file)
--- a/drivers/ide/pci/sl82c105.c
+++ b/drivers/ide/pci/sl82c105.c
@@ -465,6 +465,9 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
                        hwif->autodma = 1;
                hwif->drives[0].autodma = hwif->autodma;
                hwif->drives[1].autodma = hwif->autodma;
+
+               if (hwif->mate)
+                       hwif->serialized = hwif->mate->serialized = 1;
 #endif /* CONFIG_BLK_DEV_IDEDMA */
        }
        hwif->OUTB(dma_state, hwif->dma_base + 2);