diff --git a/drivers/staging/comedi/drivers/mf6x4.c b/drivers/staging/comedi/drivers/mf6x4.c
index ea430237efa7..9da8dd748078 100644
--- a/drivers/staging/comedi/drivers/mf6x4.c
+++ b/drivers/staging/comedi/drivers/mf6x4.c
@@ -112,8 +112,9 @@ static int mf6x4_ai_eoc(struct comedi_device *dev,
 	struct mf6x4_private *devpriv = dev->private;
 	unsigned int status;
 
+	/* EOLC goes low at end of conversion. */
 	status = ioread32(devpriv->gpioc_reg);
-	if (status & MF6X4_GPIOC_EOLC)
+	if ((status & MF6X4_GPIOC_EOLC) == 0)
 		return 0;
 	return -EBUSY;
 }