diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c
index 6f142aa54f5f93a42d273b7ca20714124a39ea7c..5bc8633c6352ac67279b8531ee02d959e137a34d 100644
--- a/drivers/ata/sata_dwc_460ex.c
+++ b/drivers/ata/sata_dwc_460ex.c
@@ -149,7 +149,11 @@ struct sata_dwc_device {
 #endif
 };
 
-#define SATA_DWC_QCMD_MAX	32
+/*
+ * Allow one extra special slot for commands and DMA management
+ * to account for libata internal commands.
+ */
+#define SATA_DWC_QCMD_MAX	(ATA_MAX_QUEUE + 1)
 
 struct sata_dwc_device_port {
 	struct sata_dwc_device	*hsdev;