diff --git a/arch/mips/alchemy/common/dbdma.c b/arch/mips/alchemy/common/dbdma.c
index 40071bd..3b2ccc0 100644
--- a/arch/mips/alchemy/common/dbdma.c
+++ b/arch/mips/alchemy/common/dbdma.c
@@ -411,8 +411,11 @@ u32 au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 		if (desc_base == 0)
 			return 0;
 
+		ctp->cdb_membase = desc_base;
 		desc_base = ALIGN_ADDR(desc_base, sizeof(au1x_ddma_desc_t));
-	}
+	} else
+		ctp->cdb_membase = desc_base;
+
 	dp = (au1x_ddma_desc_t *)desc_base;
 
 	/* Keep track of the base descriptor. */
@@ -829,7 +832,7 @@ void au1xxx_dbdma_chan_free(u32 chanid)
 
 	au1xxx_dbdma_stop(chanid);
 
-	kfree((void *)ctp->chan_desc_base);
+	kfree((void *)ctp->cdb_membase);
 
 	stp->dev_flags &= ~DEV_FLAGS_INUSE;
 	dtp->dev_flags &= ~DEV_FLAGS_INUSE;
diff --git a/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h b/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h
index c098b45..8c6b110 100644
--- a/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h
+++ b/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h
@@ -305,6 +305,7 @@ typedef struct dbdma_chan_config {
 	dbdev_tab_t		*chan_dest;
 	au1x_dma_chan_t		*chan_ptr;
 	au1x_ddma_desc_t	*chan_desc_base;
+	u32			cdb_membase; /* kmalloc base of above */
 	au1x_ddma_desc_t	*get_ptr, *put_ptr, *cur_ptr;
 	void			*chan_callparam;
 	void			(*chan_callback)(int, void *);