On 09/03/2017 07:49 PM, Sakari Ailus wrote:
> From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>
> The async subdev notifier .bound(), .unbind() and .complete() operations
> are function pointers stored directly in the v4l2_async_subdev
> structure. As the structure isn't immutable, this creates a potential
> security risk as the function pointers are mutable.
>
> To fix this, move the function pointers to a new
> v4l2_async_subdev_operations structure that can be made const in
> drivers.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Regards,
Hans
> ---
> drivers/media/platform/am437x/am437x-vpfe.c | 8 +++++--
> drivers/media/platform/atmel/atmel-isc.c | 10 ++++++---
> drivers/media/platform/atmel/atmel-isi.c | 10 ++++++---
> drivers/media/platform/davinci/vpif_capture.c | 8 +++++--
> drivers/media/platform/davinci/vpif_display.c | 8 +++++--
> drivers/media/platform/exynos4-is/media-dev.c | 8 +++++--
> drivers/media/platform/omap3isp/isp.c | 6 +++++-
> drivers/media/platform/pxa_camera.c | 8 +++++--
> drivers/media/platform/qcom/camss-8x16/camss.c | 8 +++++--
> drivers/media/platform/rcar-vin/rcar-core.c | 10 ++++++---
> drivers/media/platform/rcar_drif.c | 10 ++++++---
> drivers/media/platform/soc_camera/soc_camera.c | 14 +++++++------
> drivers/media/platform/stm32/stm32-dcmi.c | 10 ++++++---
> drivers/media/platform/ti-vpe/cal.c | 8 +++++--
> drivers/media/platform/xilinx/xilinx-vipp.c | 8 +++++--
> drivers/media/v4l2-core/v4l2-async.c | 20 +++++++++---------
> drivers/staging/media/imx/imx-media-dev.c | 8 +++++--
> include/media/v4l2-async.h | 29 +++++++++++++++++---------
> 18 files changed, 131 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
> index dfcc484cab89..0997c640191d 100644
> --- a/drivers/media/platform/am437x/am437x-vpfe.c
> +++ b/drivers/media/platform/am437x/am437x-vpfe.c
> @@ -2417,6 +2417,11 @@ static int vpfe_async_complete(struct v4l2_async_notifier *notifier)
> return vpfe_probe_complete(vpfe);
> }
>
> +static const struct v4l2_async_notifier_operations vpfe_async_ops = {
> + .bound = vpfe_async_bound,
> + .complete = vpfe_async_complete,
> +};
> +
> static struct vpfe_config *
> vpfe_get_pdata(struct platform_device *pdev)
> {
> @@ -2590,8 +2595,7 @@ static int vpfe_probe(struct platform_device *pdev)
>
> vpfe->notifier.subdevs = vpfe->cfg->asd;
> vpfe->notifier.num_subdevs = ARRAY_SIZE(vpfe->cfg->asd);
> - vpfe->notifier.bound = vpfe_async_bound;
> - vpfe->notifier.complete = vpfe_async_complete;
> + vpfe->notifier.ops = &vpfe_async_ops;
> ret = v4l2_async_notifier_register(&vpfe->v4l2_dev,
> &vpfe->notifier);
> if (ret) {
> diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
> index d7103c5f92c3..48544c4137cb 100644
> --- a/drivers/media/platform/atmel/atmel-isc.c
> +++ b/drivers/media/platform/atmel/atmel-isc.c
> @@ -1639,6 +1639,12 @@ static int isc_async_complete(struct v4l2_async_notifier *notifier)
> return 0;
> }
>
> +static const struct v4l2_async_notifier_operations isc_async_ops = {
> + .bound = isc_async_bound,
> + .unbind = isc_async_unbind,
> + .complete = isc_async_complete,
> +};
> +
> static void isc_subdev_cleanup(struct isc_device *isc)
> {
> struct isc_subdev_entity *subdev_entity;
> @@ -1851,9 +1857,7 @@ static int atmel_isc_probe(struct platform_device *pdev)
> list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
> subdev_entity->notifier.subdevs = &subdev_entity->asd;
> subdev_entity->notifier.num_subdevs = 1;
> - subdev_entity->notifier.bound = isc_async_bound;
> - subdev_entity->notifier.unbind = isc_async_unbind;
> - subdev_entity->notifier.complete = isc_async_complete;
> + subdev_entity->notifier.ops = &isc_async_ops;
>
> ret = v4l2_async_notifier_register(&isc->v4l2_dev,
> &subdev_entity->notifier);
> diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
> index 891fa2505efa..eadbf9def358 100644
> --- a/drivers/media/platform/atmel/atmel-isi.c
> +++ b/drivers/media/platform/atmel/atmel-isi.c
> @@ -1105,6 +1105,12 @@ static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
> return 0;
> }
>
> +static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
> + .bound = isi_graph_notify_bound,
> + .unbind = isi_graph_notify_unbind,
> + .complete = isi_graph_notify_complete,
> +};
> +
> static int isi_graph_parse(struct atmel_isi *isi, struct device_node *node)
> {
> struct device_node *ep = NULL;
> @@ -1152,9 +1158,7 @@ static int isi_graph_init(struct atmel_isi *isi)
>
> isi->notifier.subdevs = subdevs;
> isi->notifier.num_subdevs = 1;
> - isi->notifier.bound = isi_graph_notify_bound;
> - isi->notifier.unbind = isi_graph_notify_unbind;
> - isi->notifier.complete = isi_graph_notify_complete;
> + isi->notifier.ops = &isi_graph_notify_ops;
>
> ret = v4l2_async_notifier_register(&isi->v4l2_dev, &isi->notifier);
> if (ret < 0) {
> diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
> index 0ef36cec21d1..a89367ab1e06 100644
> --- a/drivers/media/platform/davinci/vpif_capture.c
> +++ b/drivers/media/platform/davinci/vpif_capture.c
> @@ -1500,6 +1500,11 @@ static int vpif_async_complete(struct v4l2_async_notifier *notifier)
> return vpif_probe_complete();
> }
>
> +static const struct v4l2_async_notifier_operations vpif_async_ops = {
> + .bound = vpif_async_bound,
> + .complete = vpif_async_complete,
> +};
> +
> static struct vpif_capture_config *
> vpif_capture_get_pdata(struct platform_device *pdev)
> {
> @@ -1691,8 +1696,7 @@ static __init int vpif_probe(struct platform_device *pdev)
> } else {
> vpif_obj.notifier.subdevs = vpif_obj.config->asd;
> vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0];
> - vpif_obj.notifier.bound = vpif_async_bound;
> - vpif_obj.notifier.complete = vpif_async_complete;
> + vpif_obj.notifier.ops = &vpif_async_ops;
> err = v4l2_async_notifier_register(&vpif_obj.v4l2_dev,
> &vpif_obj.notifier);
> if (err) {
> diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c
> index 56fe4e5b396e..ff2f75a328c9 100644
> --- a/drivers/media/platform/davinci/vpif_display.c
> +++ b/drivers/media/platform/davinci/vpif_display.c
> @@ -1232,6 +1232,11 @@ static int vpif_async_complete(struct v4l2_async_notifier *notifier)
> return vpif_probe_complete();
> }
>
> +static const struct v4l2_async_notifier_operations vpif_async_ops = {
> + .bound = vpif_async_bound,
> + .complete = vpif_async_complete,
> +};
> +
> /*
> * vpif_probe: This function creates device entries by register itself to the
> * V4L2 driver and initializes fields of each channel objects
> @@ -1313,8 +1318,7 @@ static __init int vpif_probe(struct platform_device *pdev)
> } else {
> vpif_obj.notifier.subdevs = vpif_obj.config->asd;
> vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0];
> - vpif_obj.notifier.bound = vpif_async_bound;
> - vpif_obj.notifier.complete = vpif_async_complete;
> + vpif_obj.notifier.ops = &vpif_async_ops;
> err = v4l2_async_notifier_register(&vpif_obj.v4l2_dev,
> &vpif_obj.notifier);
> if (err) {
> diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
> index d4656d5175d7..c15596b56dc9 100644
> --- a/drivers/media/platform/exynos4-is/media-dev.c
> +++ b/drivers/media/platform/exynos4-is/media-dev.c
> @@ -1405,6 +1405,11 @@ static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
> return media_device_register(&fmd->media_dev);
> }
>
> +static const struct v4l2_async_notifier_operations subdev_notifier_ops = {
> + .bound = subdev_notifier_bound,
> + .complete = subdev_notifier_complete,
> +};
> +
> static int fimc_md_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -1479,8 +1484,7 @@ static int fimc_md_probe(struct platform_device *pdev)
> if (fmd->num_sensors > 0) {
> fmd->subdev_notifier.subdevs = fmd->async_subdevs;
> fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
> - fmd->subdev_notifier.bound = subdev_notifier_bound;
> - fmd->subdev_notifier.complete = subdev_notifier_complete;
> + fmd->subdev_notifier.ops = &subdev_notifier_ops;
> fmd->num_sensors = 0;
>
> ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
> diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
> index 9a694924e46e..0f08d602f756 100644
> --- a/drivers/media/platform/omap3isp/isp.c
> +++ b/drivers/media/platform/omap3isp/isp.c
> @@ -2171,6 +2171,10 @@ static int isp_subdev_notifier_complete(struct v4l2_async_notifier *async)
> return media_device_register(&isp->media_dev);
> }
>
> +static const struct v4l2_async_notifier_operations isp_subdev_notifier_ops = {
> + .complete = isp_subdev_notifier_complete,
> +};
> +
> /*
> * isp_probe - Probe ISP platform device
> * @pdev: Pointer to ISP platform device
> @@ -2341,7 +2345,7 @@ static int isp_probe(struct platform_device *pdev)
> if (ret < 0)
> goto error_register_entities;
>
> - isp->notifier.complete = isp_subdev_notifier_complete;
> + isp->notifier.ops = &isp_subdev_notifier_ops;
>
> ret = v4l2_async_notifier_register(&isp->v4l2_dev, &isp->notifier);
> if (ret)
> diff --git a/drivers/media/platform/pxa_camera.c b/drivers/media/platform/pxa_camera.c
> index edca993c2b1f..9d3f0cb1d95a 100644
> --- a/drivers/media/platform/pxa_camera.c
> +++ b/drivers/media/platform/pxa_camera.c
> @@ -2221,6 +2221,11 @@ static void pxa_camera_sensor_unbind(struct v4l2_async_notifier *notifier,
> mutex_unlock(&pcdev->mlock);
> }
>
> +static const struct v4l2_async_notifier_operations pxa_camera_sensor_ops = {
> + .bound = pxa_camera_sensor_bound,
> + .unbind = pxa_camera_sensor_unbind,
> +};
> +
> /*
> * Driver probe, remove, suspend and resume operations
> */
> @@ -2489,8 +2494,7 @@ static int pxa_camera_probe(struct platform_device *pdev)
> pcdev->asds[0] = &pcdev->asd;
> pcdev->notifier.subdevs = pcdev->asds;
> pcdev->notifier.num_subdevs = 1;
> - pcdev->notifier.bound = pxa_camera_sensor_bound;
> - pcdev->notifier.unbind = pxa_camera_sensor_unbind;
> + pcdev->notifier.ops = &pxa_camera_sensor_ops;
>
> if (!of_have_populated_dt())
> pcdev->asd.match_type = V4L2_ASYNC_MATCH_I2C;
> diff --git a/drivers/media/platform/qcom/camss-8x16/camss.c b/drivers/media/platform/qcom/camss-8x16/camss.c
> index a3760b5dd1d1..390a42c17b66 100644
> --- a/drivers/media/platform/qcom/camss-8x16/camss.c
> +++ b/drivers/media/platform/qcom/camss-8x16/camss.c
> @@ -601,6 +601,11 @@ static int camss_subdev_notifier_complete(struct v4l2_async_notifier *async)
> return media_device_register(&camss->media_dev);
> }
>
> +static const struct v4l2_async_notifier_operations camss_subdev_notifier_ops = {
> + .bound = camss_subdev_notifier_bound,
> + .complete = camss_subdev_notifier_complete,
> +};
> +
> static const struct media_device_ops camss_media_ops = {
> .link_notify = v4l2_pipeline_link_notify,
> };
> @@ -655,8 +660,7 @@ static int camss_probe(struct platform_device *pdev)
> goto err_register_entities;
>
> if (camss->notifier.num_subdevs) {
> - camss->notifier.bound = camss_subdev_notifier_bound;
> - camss->notifier.complete = camss_subdev_notifier_complete;
> + camss->notifier.ops = &camss_subdev_notifier_ops;
>
> ret = v4l2_async_notifier_register(&camss->v4l2_dev,
> &camss->notifier);
> diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> index bd551f0be213..f55b0ef29a56 100644
> --- a/drivers/media/platform/rcar-vin/rcar-core.c
> +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> @@ -134,6 +134,12 @@ static int rvin_digital_notify_bound(struct v4l2_async_notifier *notifier,
>
> return 0;
> }
> +static const struct v4l2_async_notifier_operations rvin_digital_notify_ops = {
> + .bound = rvin_digital_notify_bound,
> + .unbind = rvin_digital_notify_unbind,
> + .complete = rvin_digital_notify_complete,
> +};
> +
>
> static int rvin_digital_parse_v4l2(struct device *dev,
> struct v4l2_fwnode_endpoint *vep,
> @@ -182,9 +188,7 @@ static int rvin_digital_graph_init(struct rvin_dev *vin)
> to_of_node(
> vin->notifier.subdevs[0]->match.fwnode.fwnode));
>
> - vin->notifier.bound = rvin_digital_notify_bound;
> - vin->notifier.unbind = rvin_digital_notify_unbind;
> - vin->notifier.complete = rvin_digital_notify_complete;
> + vin->notifier.ops = &rvin_digital_notify_ops;
> ret = v4l2_async_notifier_register(&vin->v4l2_dev, &vin->notifier);
> if (ret < 0) {
> vin_err(vin, "Notifier registration failed\n");
> diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
> index 522364ff0d5d..0b2214d6d621 100644
> --- a/drivers/media/platform/rcar_drif.c
> +++ b/drivers/media/platform/rcar_drif.c
> @@ -1185,6 +1185,12 @@ static int rcar_drif_notify_complete(struct v4l2_async_notifier *notifier)
> return ret;
> }
>
> +static const struct v4l2_async_notifier_operations rcar_drif_notify_ops = {
> + .bound = rcar_drif_notify_bound,
> + .unbind = rcar_drif_notify_unbind,
> + .complete = rcar_drif_notify_complete,
> +};
> +
> /* Read endpoint properties */
> static void rcar_drif_get_ep_properties(struct rcar_drif_sdr *sdr,
> struct fwnode_handle *fwnode)
> @@ -1347,9 +1353,7 @@ static int rcar_drif_sdr_probe(struct rcar_drif_sdr *sdr)
> if (ret)
> goto error;
>
> - sdr->notifier.bound = rcar_drif_notify_bound;
> - sdr->notifier.unbind = rcar_drif_notify_unbind;
> - sdr->notifier.complete = rcar_drif_notify_complete;
> + sdr->notifier.ops = &rcar_drif_notify_ops;
>
> /* Register notifier */
> ret = v4l2_async_notifier_register(&sdr->v4l2_dev, &sdr->notifier);
> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> index 1f3c450c7a69..916ff68b73d4 100644
> --- a/drivers/media/platform/soc_camera/soc_camera.c
> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> @@ -1391,6 +1391,12 @@ static int soc_camera_async_complete(struct v4l2_async_notifier *notifier)
> return 0;
> }
>
> +static const struct v4l2_async_notifier_operations soc_camera_async_ops = {
> + .bound = soc_camera_async_bound,
> + .unbind = soc_camera_async_unbind,
> + .complete = soc_camera_async_complete,
> +};
> +
> static int scan_async_group(struct soc_camera_host *ici,
> struct v4l2_async_subdev **asd, unsigned int size)
> {
> @@ -1437,9 +1443,7 @@ static int scan_async_group(struct soc_camera_host *ici,
>
> sasc->notifier.subdevs = asd;
> sasc->notifier.num_subdevs = size;
> - sasc->notifier.bound = soc_camera_async_bound;
> - sasc->notifier.unbind = soc_camera_async_unbind;
> - sasc->notifier.complete = soc_camera_async_complete;
> + sasc->notifier.ops = &soc_camera_async_ops;
>
> icd->sasc = sasc;
> icd->parent = ici->v4l2_dev.dev;
> @@ -1537,9 +1541,7 @@ static int soc_of_bind(struct soc_camera_host *ici,
>
> sasc->notifier.subdevs = &info->subdev;
> sasc->notifier.num_subdevs = 1;
> - sasc->notifier.bound = soc_camera_async_bound;
> - sasc->notifier.unbind = soc_camera_async_unbind;
> - sasc->notifier.complete = soc_camera_async_complete;
> + sasc->notifier.ops = &soc_camera_async_ops;
>
> icd->sasc = sasc;
> icd->parent = ici->v4l2_dev.dev;
> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
> index 35ba6f211b79..ac4c450a6c7d 100644
> --- a/drivers/media/platform/stm32/stm32-dcmi.c
> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
> @@ -1495,6 +1495,12 @@ static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
> return 0;
> }
>
> +static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
> + .bound = dcmi_graph_notify_bound,
> + .unbind = dcmi_graph_notify_unbind,
> + .complete = dcmi_graph_notify_complete,
> +};
> +
> static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node)
> {
> struct device_node *ep = NULL;
> @@ -1542,9 +1548,7 @@ static int dcmi_graph_init(struct stm32_dcmi *dcmi)
>
> dcmi->notifier.subdevs = subdevs;
> dcmi->notifier.num_subdevs = 1;
> - dcmi->notifier.bound = dcmi_graph_notify_bound;
> - dcmi->notifier.unbind = dcmi_graph_notify_unbind;
> - dcmi->notifier.complete = dcmi_graph_notify_complete;
> + dcmi->notifier.ops = &dcmi_graph_notify_ops;
>
> ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
> if (ret < 0) {
> diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c
> index 42e383a48ffe..8b586c864524 100644
> --- a/drivers/media/platform/ti-vpe/cal.c
> +++ b/drivers/media/platform/ti-vpe/cal.c
> @@ -1522,6 +1522,11 @@ static int cal_async_complete(struct v4l2_async_notifier *notifier)
> return 0;
> }
>
> +static const struct v4l2_async_notifier_operations cal_async_ops = {
> + .bound = cal_async_bound,
> + .complete = cal_async_complete,
> +};
> +
> static int cal_complete_ctx(struct cal_ctx *ctx)
> {
> struct video_device *vfd;
> @@ -1736,8 +1741,7 @@ static int of_cal_create_instance(struct cal_ctx *ctx, int inst)
> ctx->asd_list[0] = asd;
> ctx->notifier.subdevs = ctx->asd_list;
> ctx->notifier.num_subdevs = 1;
> - ctx->notifier.bound = cal_async_bound;
> - ctx->notifier.complete = cal_async_complete;
> + ctx->notifier.ops = &cal_async_ops;
> ret = v4l2_async_notifier_register(&ctx->v4l2_dev,
> &ctx->notifier);
> if (ret) {
> diff --git a/drivers/media/platform/xilinx/xilinx-vipp.c b/drivers/media/platform/xilinx/xilinx-vipp.c
> index ebfdf334d99c..d881cf09876d 100644
> --- a/drivers/media/platform/xilinx/xilinx-vipp.c
> +++ b/drivers/media/platform/xilinx/xilinx-vipp.c
> @@ -351,6 +351,11 @@ static int xvip_graph_notify_bound(struct v4l2_async_notifier *notifier,
> return -EINVAL;
> }
>
> +static const struct v4l2_async_notifier_operations xvip_graph_notify_ops = {
> + .bound = xvip_graph_notify_bound,
> + .complete = xvip_graph_notify_complete,
> +};
> +
> static int xvip_graph_parse_one(struct xvip_composite_device *xdev,
> struct device_node *node)
> {
> @@ -548,8 +553,7 @@ static int xvip_graph_init(struct xvip_composite_device *xdev)
>
> xdev->notifier.subdevs = subdevs;
> xdev->notifier.num_subdevs = num_subdevs;
> - xdev->notifier.bound = xvip_graph_notify_bound;
> - xdev->notifier.complete = xvip_graph_notify_complete;
> + xdev->notifier.ops = &xvip_graph_notify_ops;
>
> ret = v4l2_async_notifier_register(&xdev->v4l2_dev, &xdev->notifier);
> if (ret < 0) {
> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
> index 6740a241d4a1..810f5e0273dc 100644
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -107,16 +107,16 @@ static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
> {
> int ret;
>
> - if (notifier->bound) {
> - ret = notifier->bound(notifier, sd, asd);
> + if (notifier->ops->bound) {
> + ret = notifier->ops->bound(notifier, sd, asd);
> if (ret < 0)
> return ret;
> }
>
> ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
> if (ret < 0) {
> - if (notifier->unbind)
> - notifier->unbind(notifier, sd, asd);
> + if (notifier->ops->unbind)
> + notifier->ops->unbind(notifier, sd, asd);
> return ret;
> }
>
> @@ -128,8 +128,8 @@ static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
> /* Move from the global subdevice list to notifier's done */
> list_move(&sd->async_list, ¬ifier->done);
>
> - if (list_empty(¬ifier->waiting) && notifier->complete)
> - return notifier->complete(notifier);
> + if (list_empty(¬ifier->waiting) && notifier->ops->complete)
> + return notifier->ops->complete(notifier);
>
> return 0;
> }
> @@ -232,8 +232,8 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
> /* If we handled USB devices, we'd have to lock the parent too */
> device_release_driver(d);
>
> - if (notifier->unbind)
> - notifier->unbind(notifier, sd, sd->asd);
> + if (notifier->ops->unbind)
> + notifier->ops->unbind(notifier, sd, sd->asd);
>
> /*
> * Store device at the device cache, in order to call
> @@ -344,8 +344,8 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
>
> v4l2_async_cleanup(sd);
>
> - if (notifier->unbind)
> - notifier->unbind(notifier, sd, sd->asd);
> + if (notifier->ops->unbind)
> + notifier->ops->unbind(notifier, sd, sd->asd);
>
> mutex_unlock(&list_lock);
> }
> diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c
> index d96f4512224f..e8dc2c93658a 100644
> --- a/drivers/staging/media/imx/imx-media-dev.c
> +++ b/drivers/staging/media/imx/imx-media-dev.c
> @@ -440,6 +440,11 @@ static int imx_media_probe_complete(struct v4l2_async_notifier *notifier)
> return media_device_register(&imxmd->md);
> }
>
> +static const struct v4l2_async_notifier_operations imx_media_subdev_ops = {
> + .bound = imx_media_subdev_bound,
> + .complete = imx_media_probe_complete,
> +};
> +
> /*
> * adds controls to a video device from an entity subdevice.
> * Continues upstream from the entity's sink pads.
> @@ -608,8 +613,7 @@ static int imx_media_probe(struct platform_device *pdev)
>
> /* prepare the async subdev notifier and register it */
> imxmd->subdev_notifier.subdevs = imxmd->async_ptrs;
> - imxmd->subdev_notifier.bound = imx_media_subdev_bound;
> - imxmd->subdev_notifier.complete = imx_media_probe_complete;
> + imxmd->subdev_notifier.ops = &imx_media_subdev_ops;
> ret = v4l2_async_notifier_register(&imxmd->v4l2_dev,
> &imxmd->subdev_notifier);
> if (ret) {
> diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
> index 96fa1afc00dd..3c48f8b66d12 100644
> --- a/include/media/v4l2-async.h
> +++ b/include/media/v4l2-async.h
> @@ -18,6 +18,7 @@ struct device;
> struct device_node;
> struct v4l2_device;
> struct v4l2_subdev;
> +struct v4l2_async_notifier;
>
> /* A random max subdevice number, used to allocate an array on stack */
> #define V4L2_MAX_SUBDEVS 128U
> @@ -79,8 +80,25 @@ struct v4l2_async_subdev {
> };
>
> /**
> + * struct v4l2_async_notifier_operations - Asynchronous V4L2 notifier operations
> + * @bound: a subdevice driver has successfully probed one of the subdevices
> + * @complete: all subdevices have been probed successfully
> + * @unbind: a subdevice is leaving
> + */
> +struct v4l2_async_notifier_operations {
> + int (*bound)(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd);
> + int (*complete)(struct v4l2_async_notifier *notifier);
> + void (*unbind)(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd);
> +};
> +
> +/**
> * struct v4l2_async_notifier - v4l2_device notifier data
> *
> + * @ops: notifier operations
> * @num_subdevs: number of subdevices used in the subdevs array
> * @max_subdevs: number of subdevices allocated in the subdevs array
> * @subdevs: array of pointers to subdevice descriptors
> @@ -88,11 +106,9 @@ struct v4l2_async_subdev {
> * @waiting: list of struct v4l2_async_subdev, waiting for their drivers
> * @done: list of struct v4l2_subdev, already probed
> * @list: member in a global list of notifiers
> - * @bound: a subdevice driver has successfully probed one of subdevices
> - * @complete: all subdevices have been probed successfully
> - * @unbind: a subdevice is leaving
> */
> struct v4l2_async_notifier {
> + const struct v4l2_async_notifier_operations *ops;
> unsigned int num_subdevs;
> unsigned int max_subdevs;
> struct v4l2_async_subdev **subdevs;
> @@ -100,13 +116,6 @@ struct v4l2_async_notifier {
> struct list_head waiting;
> struct list_head done;
> struct list_head list;
> - int (*bound)(struct v4l2_async_notifier *notifier,
> - struct v4l2_subdev *subdev,
> - struct v4l2_async_subdev *asd);
> - int (*complete)(struct v4l2_async_notifier *notifier);
> - void (*unbind)(struct v4l2_async_notifier *notifier,
> - struct v4l2_subdev *subdev,
> - struct v4l2_async_subdev *asd);
> };
>
> /**
>
