[PATCH 1/1] remoteproc: fix vdev reference management

From: Loic Pallardy
Date: Wed Dec 14 2016 - 10:11:12 EST

Commit 2b45cef5868a ("remoteproc: Further extend the vdev life cycle")
extends kref support for vdev management.
It introduces a regression when following sequence is executed:
rproc_boot --> rproc_shutdown --> rproc_boot
Second rproc_boot call crashes on register_virtio_device as device
is already existing.
Issue is previous vdev is never released when rproc is stop because
associated refcount is too high.

kref_get introduces is not needed as kref_init already initializes
krefcount to 1 because it considers associated variable as used.
This introduces a misalignment between kref_get and kref_put calls.

Signed-off-by: Loic Pallardy <loic.pallardy@xxxxxx>
drivers/remoteproc/remoteproc_core.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 9a507e7..feb24c4 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -396,9 +396,6 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
goto unwind_vring_allocations;

- /* track the rvdevs list reference */
- kref_get(&rvdev->refcount);
list_add_tail(&rvdev->node, &rproc->rvdevs);

rproc_add_subdev(rproc, &rvdev->subdev,