On Fri, 2016-11-11 at 11:51 +0100, Hans Verkuil wrote:
> Almost correct:
>
> On 11/07/2016 01:42 PM, Minghsiu Tsai wrote:
> > It can fix known problems with embedded video_device structs.
> >
> > Signed-off-by: Minghsiu Tsai <minghsiu.tsai@xxxxxxxxxxxx>
> > ---
> > drivers/media/platform/mtk-mdp/mtk_mdp_core.h | 2 +-
> > drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c | 33 ++++++++++++++++-----------
> > 2 files changed, 21 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
> > index 848569d..ad1cff3 100644
> > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
> > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.h
> > @@ -167,7 +167,7 @@ struct mtk_mdp_dev {
> > struct mtk_mdp_comp *comp[MTK_MDP_COMP_ID_MAX];
> > struct v4l2_m2m_dev *m2m_dev;
> > struct list_head ctx_list;
> > - struct video_device vdev;
> > + struct video_device *vdev;
> > struct v4l2_device v4l2_dev;
> > struct workqueue_struct *job_wq;
> > struct platform_device *vpu_dev;
> > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
> > index 9a747e7..b8dee1c 100644
> > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
> > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
> > @@ -1236,16 +1236,22 @@ int mtk_mdp_register_m2m_device(struct mtk_mdp_dev *mdp)
> > int ret;
> >
> > mdp->variant = &mtk_mdp_default_variant;
> > - mdp->vdev.device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> > - mdp->vdev.fops = &mtk_mdp_m2m_fops;
> > - mdp->vdev.ioctl_ops = &mtk_mdp_m2m_ioctl_ops;
> > - mdp->vdev.release = video_device_release_empty;
> > - mdp->vdev.lock = &mdp->lock;
> > - mdp->vdev.vfl_dir = VFL_DIR_M2M;
> > - mdp->vdev.v4l2_dev = &mdp->v4l2_dev;
> > - snprintf(mdp->vdev.name, sizeof(mdp->vdev.name), "%s:m2m",
> > + mdp->vdev = video_device_alloc();
> > + if (!mdp->vdev) {
> > + dev_err(dev, "failed to allocate video device\n");
> > + ret = -ENOMEM;
> > + goto err_video_alloc;
> > + }
> > + mdp->vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> > + mdp->vdev->fops = &mtk_mdp_m2m_fops;
> > + mdp->vdev->ioctl_ops = &mtk_mdp_m2m_ioctl_ops;
> > + mdp->vdev->release = video_device_release;
> > + mdp->vdev->lock = &mdp->lock;
> > + mdp->vdev->vfl_dir = VFL_DIR_M2M;
> > + mdp->vdev->v4l2_dev = &mdp->v4l2_dev;
> > + snprintf(mdp->vdev->name, sizeof(mdp->vdev->name), "%s:m2m",
> > MTK_MDP_MODULE_NAME);
> > - video_set_drvdata(&mdp->vdev, mdp);
> > + video_set_drvdata(mdp->vdev, mdp);
> >
> > mdp->m2m_dev = v4l2_m2m_init(&mtk_mdp_m2m_ops);
> > if (IS_ERR(mdp->m2m_dev)) {
> > @@ -1254,26 +1260,27 @@ int mtk_mdp_register_m2m_device(struct mtk_mdp_dev *mdp)
> > goto err_m2m_init;
> > }
> >
> > - ret = video_register_device(&mdp->vdev, VFL_TYPE_GRABBER, 2);
> > + ret = video_register_device(mdp->vdev, VFL_TYPE_GRABBER, 2);
> > if (ret) {
> > dev_err(dev, "failed to register video device\n");
> > goto err_vdev_register;
> > }
> >
> > v4l2_info(&mdp->v4l2_dev, "driver registered as /dev/video%d",
> > - mdp->vdev.num);
> > + mdp->vdev->num);
> > return 0;
> >
> > err_vdev_register:
> > v4l2_m2m_release(mdp->m2m_dev);
> > err_m2m_init:
> > - video_device_release(&mdp->vdev);
> > + video_unregister_device(mdp->vdev);
>
> This should remain video_device_release: the video_register_device call failed, so
> the device hasn't been registered. In that case just release the device (i.e.
> free the allocated memory).
>
Hi Hans,
I have uploaded patch v2 for this. Thanks for your review.
Best regards,
Ming Hsiu
> > +err_video_alloc:
> >
> > return ret;
> > }
> >
> > void mtk_mdp_unregister_m2m_device(struct mtk_mdp_dev *mdp)
> > {
> > - video_device_release(&mdp->vdev);
> > + video_unregister_device(mdp->vdev);
> > v4l2_m2m_release(mdp->m2m_dev);
> > }
> >
>
> Regards,
>
> Hans
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