[RFC PATCH v2 2/6] remoteproc: core: Introduce rproc_register_rvdev function

[Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>]

The rproc structure contains a list of registered rproc_vdev structure.
To be able to move the management of the rproc_vdev structure in
remoteproc_virtio.c (i.e rproc_rvdev_add_device and
rproc_rvdev_remove_device functions), introduce the rproc_register_rvdev
and rproc_unregister_rvdev functions.
These functions will be exported by the remoteproc_core.c.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
Update vs previous revision:
  - add rproc struct as parameter of the rproc_register_rvdev function
---
 drivers/remoteproc/remoteproc_core.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index d1f1c5c25bd7..fcc55dbfba3b 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -484,6 +484,18 @@ static int copy_dma_range_map(struct device *to, struct device *from)
 	return 0;
 }
 
+static void rproc_register_rvdev(struct rproc *rproc, struct rproc_vdev *rvdev)
+{
+	if (rvdev && rproc)
+		list_add_tail(&rvdev->node, &rproc->rvdevs);
+}
+
+static void rproc_unregister_rvdev(struct rproc_vdev *rvdev)
+{
+	if (rvdev)
+		list_del(&rvdev->node);
+}
+
 static int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
 {
 	struct rproc *rproc = rvdev->rproc;
@@ -516,7 +528,7 @@ static int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
 			 dma_get_mask(rproc->dev.parent), ERR_PTR(ret));
 	}
 
-	list_add_tail(&rvdev->node, &rproc->rvdevs);
+	rproc_register_rvdev(rproc, rvdev);
 
 	rvdev->subdev.start = rproc_vdev_do_start;
 	rvdev->subdev.stop = rproc_vdev_do_stop;
@@ -535,7 +547,7 @@ static void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
 	struct rproc *rproc = rvdev->rproc;
 
 	rproc_remove_subdev(rproc, &rvdev->subdev);
-	list_del(&rvdev->node);
+	rproc_unregister_rvdev(rvdev);
 	device_unregister(&rvdev->dev);
 }
 
-- 
2.17.1