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[media] s5p-fimc: Prevent race conditions during subdevs registration
Make sure when fimc and fimc-lite capture video node is registered it has valid pipeline_ops assigned to it. Otherwise when a video node is opened right after is was registered there, might be an attempt to use ops that are just being assigned, after function v4l2_device_register_subdev() returns. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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86163adb81
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@ -1774,9 +1774,13 @@ static int fimc_capture_subdev_registered(struct v4l2_subdev *sd)
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if (ret)
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return ret;
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fimc->pipeline_ops = v4l2_get_subdev_hostdata(sd);
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ret = fimc_register_capture_device(fimc, sd->v4l2_dev);
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if (ret)
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if (ret) {
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fimc_unregister_m2m_device(fimc);
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fimc->pipeline_ops = NULL;
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}
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return ret;
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}
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@ -1793,6 +1797,7 @@ static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
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if (video_is_registered(&fimc->vid_cap.vfd)) {
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video_unregister_device(&fimc->vid_cap.vfd);
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media_entity_cleanup(&fimc->vid_cap.vfd.entity);
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fimc->pipeline_ops = NULL;
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}
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kfree(fimc->vid_cap.ctx);
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fimc->vid_cap.ctx = NULL;
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@ -1263,10 +1263,12 @@ static int fimc_lite_subdev_registered(struct v4l2_subdev *sd)
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return ret;
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video_set_drvdata(vfd, fimc);
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fimc->pipeline_ops = v4l2_get_subdev_hostdata(sd);
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ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
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if (ret < 0) {
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media_entity_cleanup(&vfd->entity);
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fimc->pipeline_ops = NULL;
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return ret;
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}
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@ -1285,6 +1287,7 @@ static void fimc_lite_subdev_unregistered(struct v4l2_subdev *sd)
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if (video_is_registered(&fimc->vfd)) {
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video_unregister_device(&fimc->vfd);
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media_entity_cleanup(&fimc->vfd.entity);
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fimc->pipeline_ops = NULL;
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}
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}
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@ -352,6 +352,7 @@ static int fimc_register_callback(struct device *dev, void *p)
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sd = &fimc->vid_cap.subdev;
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sd->grp_id = FIMC_GROUP_ID;
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v4l2_set_subdev_hostdata(sd, (void *)&fimc_pipeline_ops);
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ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
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if (ret) {
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@ -360,7 +361,6 @@ static int fimc_register_callback(struct device *dev, void *p)
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return ret;
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}
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fimc->pipeline_ops = &fimc_pipeline_ops;
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fmd->fimc[fimc->id] = fimc;
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return 0;
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}
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@ -375,6 +375,7 @@ static int fimc_lite_register_callback(struct device *dev, void *p)
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return 0;
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fimc->subdev.grp_id = FLITE_GROUP_ID;
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v4l2_set_subdev_hostdata(&fimc->subdev, (void *)&fimc_pipeline_ops);
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ret = v4l2_device_register_subdev(&fmd->v4l2_dev, &fimc->subdev);
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if (ret) {
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@ -384,7 +385,6 @@ static int fimc_lite_register_callback(struct device *dev, void *p)
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return ret;
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}
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fimc->pipeline_ops = &fimc_pipeline_ops;
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fmd->fimc_lite[fimc->index] = fimc;
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return 0;
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}
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