staging: comedi: pass subdevice to comedi_buf_is_mmapped()

Change the parameters of `comedi_buf_is_mmapped()` to pass a pointer to
the comedi subdevice instead of a pointer to the "async" structure
belonging to the subdevice.

The main aim at the moment is to replace all the `struct comedi_async *`
parameters with `struct comedi_subdevice *` parameters in the comedi
driver API.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c
index fa5d6d4..46de933 100644
--- a/drivers/staging/comedi/comedi_buf.c
+++ b/drivers/staging/comedi/comedi_buf.c
@@ -183,9 +183,9 @@ comedi_buf_map_from_subdev_get(struct comedi_subdevice *s)
 	return bm;
 }
 
-bool comedi_buf_is_mmapped(struct comedi_async *async)
+bool comedi_buf_is_mmapped(struct comedi_subdevice *s)
 {
-	struct comedi_buf_map *bm = async->buf_map;
+	struct comedi_buf_map *bm = s->async->buf_map;
 
 	return bm && (atomic_read(&bm->refcount.refcount) > 1);
 }