diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index d689df52eae3..c73aa3bbaa3e 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -2052,7 +2052,7 @@ static void mv_port_init(struct ata_ioports *port,  void __iomem *port_mmio)
 	port->altstatus_addr = port->ctl_addr = shd_base + SHD_CTL_AST_OFS;
 
 	/* unused: */
-	port->cmd_addr = port->bmdma_addr = port->scr_addr = 0;
+	port->cmd_addr = port->bmdma_addr = port->scr_addr = NULL;
 
 	/* Clear any currently outstanding port interrupt conditions */
 	serr_ofs = mv_scr_offset(SCR_ERROR);
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
index dca3d3749f06..14872556334b 100644
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -339,7 +339,7 @@ static inline void __iomem *sil_scr_addr(struct ata_port *ap, unsigned int sc_re
 		break;
 	}
 
-	return 0;
+	return NULL;
 }
 
 static u32 sil_scr_read (struct ata_port *ap, unsigned int sc_reg)