diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index b7ac80b..fd5fe4e 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -147,7 +147,9 @@
  *	@tf: ATA taskfile register set for storing input
  *
  *	Reads ATA taskfile registers for currently-selected device
- *	into @tf.
+ *	into @tf. Assumes the device has a fully SFF compliant task file
+ *	layout and behaviour. If you device does not (eg has a different
+ *	status method) then you will need to provide a replacement tf_read
  *
  *	LOCKING:
  *	Inherited from caller.
@@ -156,7 +158,7 @@
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;
 
-	tf->command = ata_chk_status(ap);
+	tf->command = ata_check_status(ap);
 	tf->feature = ioread8(ioaddr->error_addr);
 	tf->nsect = ioread8(ioaddr->nsect_addr);
 	tf->lbal = ioread8(ioaddr->lbal_addr);