diff --git a/drivers/staging/comedi/drivers/mite.c b/drivers/staging/comedi/drivers/mite.c
index 6c8bd7c33082a1c8814b579ccc1871e2f83b0c65..2d224cfe72e375fe8ffcfc9691e09152322526b4 100644
--- a/drivers/staging/comedi/drivers/mite.c
+++ b/drivers/staging/comedi/drivers/mite.c
@@ -307,8 +307,9 @@ EXPORT_SYMBOL_GPL(mite_dma_arm);
 /**************************************/
 
 int mite_buf_change(struct mite_dma_descriptor_ring *ring,
-		    struct comedi_async *async)
+		    struct comedi_subdevice *s)
 {
+	struct comedi_async *async = s->async;
 	unsigned int n_links;
 	int i;
 
@@ -333,7 +334,7 @@ int mite_buf_change(struct mite_dma_descriptor_ring *ring,
 			       n_links * sizeof(struct mite_dma_descriptor),
 			       &ring->descriptors_dma_addr, GFP_KERNEL);
 	if (!ring->descriptors) {
-		dev_err(async->subdevice->device->class_dev,
+		dev_err(s->device->class_dev,
 			"mite: ring buffer allocation failed\n");
 		return -ENOMEM;
 	}
diff --git a/drivers/staging/comedi/drivers/mite.h b/drivers/staging/comedi/drivers/mite.h
index 78f2357479913e054e084bb4ced30e670327fb2c..929b9bb3fcedecfa9e3902ffd105b72d45ae125b 100644
--- a/drivers/staging/comedi/drivers/mite.h
+++ b/drivers/staging/comedi/drivers/mite.h
@@ -120,7 +120,7 @@ int mite_done(struct mite_channel *mite_chan);
 void mite_prep_dma(struct mite_channel *mite_chan,
 		   unsigned int num_device_bits, unsigned int num_memory_bits);
 int mite_buf_change(struct mite_dma_descriptor_ring *ring,
-		    struct comedi_async *async);
+		    struct comedi_subdevice *s);
 
 static inline int CHAN_OFFSET(int channel)
 {
diff --git a/drivers/staging/comedi/drivers/ni_660x.c b/drivers/staging/comedi/drivers/ni_660x.c
index 2858b3d559c1fe1b492bb74d0f69252606d4432f..3901e3b5ba5115c1c3929eec2430ef251e363772 100644
--- a/drivers/staging/comedi/drivers/ni_660x.c
+++ b/drivers/staging/comedi/drivers/ni_660x.c
@@ -836,7 +836,7 @@ static int ni_660x_buf_change(struct comedi_device *dev,
 	struct ni_gpct *counter = s->private;
 	int ret;
 
-	ret = mite_buf_change(mite_ring(devpriv, counter), s->async);
+	ret = mite_buf_change(mite_ring(devpriv, counter), s);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/staging/comedi/drivers/ni_pcidio.c b/drivers/staging/comedi/drivers/ni_pcidio.c
index d0ad82a3b4b9b44c3d968bc896d7017f77eeb033..1f8423504031b15afd3c5539ea232ce5b0f3f7ab 100644
--- a/drivers/staging/comedi/drivers/ni_pcidio.c
+++ b/drivers/staging/comedi/drivers/ni_pcidio.c
@@ -806,7 +806,7 @@ static int ni_pcidio_change(struct comedi_device *dev,
 	struct nidio96_private *devpriv = dev->private;
 	int ret;
 
-	ret = mite_buf_change(devpriv->di_mite_ring, s->async);
+	ret = mite_buf_change(devpriv->di_mite_ring, s);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/staging/comedi/drivers/ni_pcimio.c b/drivers/staging/comedi/drivers/ni_pcimio.c
index d40df072583cba425d5d84b71bfd291d295d0a47..89300dc78e3529d7daa1a57700c405d6d307fea7 100644
--- a/drivers/staging/comedi/drivers/ni_pcimio.c
+++ b/drivers/staging/comedi/drivers/ni_pcimio.c
@@ -1560,7 +1560,7 @@ static int pcimio_ai_change(struct comedi_device *dev,
 	struct ni_private *devpriv = dev->private;
 	int ret;
 
-	ret = mite_buf_change(devpriv->ai_mite_ring, s->async);
+	ret = mite_buf_change(devpriv->ai_mite_ring, s);
 	if (ret < 0)
 		return ret;
 
@@ -1573,7 +1573,7 @@ static int pcimio_ao_change(struct comedi_device *dev,
 	struct ni_private *devpriv = dev->private;
 	int ret;
 
-	ret = mite_buf_change(devpriv->ao_mite_ring, s->async);
+	ret = mite_buf_change(devpriv->ao_mite_ring, s);
 	if (ret < 0)
 		return ret;
 
@@ -1587,7 +1587,7 @@ static int pcimio_gpct0_change(struct comedi_device *dev,
 	struct ni_private *devpriv = dev->private;
 	int ret;
 
-	ret = mite_buf_change(devpriv->gpct_mite_ring[0], s->async);
+	ret = mite_buf_change(devpriv->gpct_mite_ring[0], s);
 	if (ret < 0)
 		return ret;
 
@@ -1601,7 +1601,7 @@ static int pcimio_gpct1_change(struct comedi_device *dev,
 	struct ni_private *devpriv = dev->private;
 	int ret;
 
-	ret = mite_buf_change(devpriv->gpct_mite_ring[1], s->async);
+	ret = mite_buf_change(devpriv->gpct_mite_ring[1], s);
 	if (ret < 0)
 		return ret;
 
@@ -1614,7 +1614,7 @@ static int pcimio_dio_change(struct comedi_device *dev,
 	struct ni_private *devpriv = dev->private;
 	int ret;
 
-	ret = mite_buf_change(devpriv->cdo_mite_ring, s->async);
+	ret = mite_buf_change(devpriv->cdo_mite_ring, s);
 	if (ret < 0)
 		return ret;