[PATCH 7/7] vimc: free vimc_cap_device when the last user disappears

[Hans Verkuil]

Don't free vimc_cap_device immediately, instead do this
in the video_device release function which is called when the
last user closes the video device. Only then is it safe to
free the memory.

Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
---
 drivers/media/platform/vimc/vimc-capture.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/vimc/vimc-capture.c 
b/drivers/media/platform/vimc/vimc-capture.c
index ea869631a3f6..3d433361d297 100644
--- a/drivers/media/platform/vimc/vimc-capture.c
+++ b/drivers/media/platform/vimc/vimc-capture.c
@@ -338,6 +338,15 @@ static const struct media_entity_operations vimc_cap_mops 
= {
        .link_validate          = vimc_link_validate,
 };
 
+static void vimc_cap_release(struct video_device *vdev)
+{
+       struct vimc_cap_device *vcap = container_of(vdev, struct 
vimc_cap_device,
+                                                   vdev);
+
+       vimc_pads_cleanup(vcap->ved.pads);
+       kfree(vcap);
+}
+
 static void vimc_cap_comp_unbind(struct device *comp, struct device *master,
                                 void *master_data)
 {
@@ -348,8 +357,6 @@ static void vimc_cap_comp_unbind(struct device *comp, 
struct device *master,
        vb2_queue_release(&vcap->queue);
        media_entity_cleanup(ved->ent);
        video_unregister_device(&vcap->vdev);
-       vimc_pads_cleanup(vcap->ved.pads);
-       kfree(vcap);
 }
 
 static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
@@ -467,7 +474,7 @@ static int vimc_cap_comp_bind(struct device *comp, struct 
device *master,
        vdev = &vcap->vdev;
        vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
        vdev->entity.ops = &vimc_cap_mops;
-       vdev->release = video_device_release_empty;
+       vdev->release = vimc_cap_release;
        vdev->fops = &vimc_cap_fops;
        vdev->ioctl_ops = &vimc_cap_ioctl_ops;
        vdev->lock = &vcap->lock;
-- 
2.20.1