diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index c7377d012a6d..ee127b368d57 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2352,9 +2352,9 @@ int comedi_find_board_minor(struct device *hardware_device)
 	return -ENODEV;
 }
 
-int comedi_alloc_subdevice_minor(struct comedi_device *dev,
-				 struct comedi_subdevice *s)
+int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
 {
+	struct comedi_device *dev = s->device;
 	struct comedi_file_info *info;
 	struct device *csdev;
 	unsigned i;
diff --git a/drivers/staging/comedi/comedi_internal.h b/drivers/staging/comedi/comedi_internal.h
index f4f0ff293797..df4c67652933 100644
--- a/drivers/staging/comedi/comedi_internal.h
+++ b/drivers/staging/comedi/comedi_internal.h
@@ -11,8 +11,7 @@ int do_rangeinfo_ioctl(struct comedi_device *dev,
 int comedi_alloc_board_minor(struct device *hardware_device);
 void comedi_free_board_minor(unsigned minor);
 int comedi_find_board_minor(struct device *hardware_device);
-int comedi_alloc_subdevice_minor(struct comedi_device *dev,
-				 struct comedi_subdevice *s);
+int comedi_alloc_subdevice_minor(struct comedi_subdevice *s);
 void comedi_free_subdevice_minor(struct comedi_subdevice *s);
 
 int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
index fe91e758184f..cc6240aa5790 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -209,7 +209,7 @@ static int __comedi_device_postconfig_async(struct comedi_device *dev,
 			return ret;
 	}
 
-	comedi_alloc_subdevice_minor(dev, s);
+	comedi_alloc_subdevice_minor(s);
 
 	return 0;
 }