diff --git a/drivers/staging/comedi/drivers/amplc_pci230.c b/drivers/staging/comedi/drivers/amplc_pci230.c
index 5c5c4e2ec3d5..4b39f6960c0a 100644
--- a/drivers/staging/comedi/drivers/amplc_pci230.c
+++ b/drivers/staging/comedi/drivers/amplc_pci230.c
@@ -2275,7 +2275,7 @@ static int pci230_ai_cancel(struct comedi_device *dev,
 static irqreturn_t pci230_interrupt(int irq, void *d)
 {
 	unsigned char status_int, valid_status_int, temp_ier;
-	struct comedi_device *dev = (struct comedi_device *)d;
+	struct comedi_device *dev = d;
 	struct pci230_private *devpriv = dev->private;
 	struct comedi_subdevice *s_ao = dev->write_subdev;
 	struct comedi_subdevice *s_ai = dev->read_subdev;
diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c
index b43e836575fd..b589e17379cc 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas.c
@@ -1234,7 +1234,7 @@ static void handle_ao_interrupt(struct comedi_device *dev, unsigned int status)
 
 static irqreturn_t cb_pcidas_interrupt(int irq, void *d)
 {
-	struct comedi_device *dev = (struct comedi_device *)d;
+	struct comedi_device *dev = d;
 	const struct cb_pcidas_board *board = dev->board_ptr;
 	struct cb_pcidas_private *devpriv = dev->private;
 	struct comedi_subdevice *s = dev->read_subdev;