diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c
index 09723b76beac..80d594d6e7c8 100644
--- a/drivers/ata/pata_acpi.c
+++ b/drivers/ata/pata_acpi.c
@@ -144,6 +144,13 @@ static void pacpi_set_dmamode(struct ata_port *ap, struct
ata_device *adev)

     /* Now stuff the nS values into the structure */
     t = ata_timing_find_mode(adev->dma_mode);
+    if (!t) {
+        pr_err("%s: ata_timing_find_mode gives NULL; adev->dma_mode: 0x%x\n",
+               __func__, adev->dma_mode);
+
+        return;
+    }
+
     if (adev->dma_mode >= XFER_UDMA_0) {
         acpi->gtm.drive[unit].dma = t->udma;