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Subject[PATCH v2 2/2] media: imx: Move pads init to probe
Date
If a subdevice is unregistered and then registered again without the
driver being removed and re-probed (which will happen when the media
device is removed and re-probed without also removing/re-probing the
subdevice), media_device_register_entity() is called with a non-zero
entity->num_pads, and then the subdevice's .registered callback calls
media_entity_pads_init(). Thus the subdevice's pad objects are added
to the media device pad list twice, causing list corruption.

One way to fix this would be to create media_entity_pads_destroy(),
and call it in the subdevice's .unregistered callback. But calling
media_entity_pads_init() in the .registered callbacks was done for
legacy reasons and is no longer necessary, so move the call to
media_entity_pads_init() into the subdevice's probe functions. This
fixes the duplicate pad obejcts in the media device pad list.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
drivers/staging/media/imx/imx-ic-prp.c | 25 ++++++-----------
drivers/staging/media/imx/imx-ic-prpencvf.c | 28 +++++++++----------
drivers/staging/media/imx/imx-media-capture.c | 15 +++++-----
drivers/staging/media/imx/imx-media-csi.c | 21 +++++++-------
drivers/staging/media/imx/imx-media-vdic.c | 27 ++++++++----------
drivers/staging/media/imx/imx6-mipi-csi2.c | 27 ++++++++----------
drivers/staging/media/imx/imx7-media-csi.c | 18 ++++++------
drivers/staging/media/imx/imx7-mipi-csis.c | 23 +++++----------
8 files changed, 81 insertions(+), 103 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prp.c b/drivers/staging/media/imx/imx-ic-prp.c
index 35e60a120dc1..2a4f77e83ed3 100644
--- a/drivers/staging/media/imx/imx-ic-prp.c
+++ b/drivers/staging/media/imx/imx-ic-prp.c
@@ -428,32 +428,19 @@ static int prp_s_frame_interval(struct v4l2_subdev *sd,
return 0;
}

-/*
- * retrieve our pads parsed from the OF graph by the media device
- */
static int prp_registered(struct v4l2_subdev *sd)
{
struct prp_priv *priv = sd_to_priv(sd);
- int i, ret;
u32 code;

- for (i = 0; i < PRP_NUM_PADS; i++) {
- priv->pad[i].flags = (i == PRP_SINK_PAD) ?
- MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
- }
-
/* init default frame interval */
priv->frame_interval.numerator = 1;
priv->frame_interval.denominator = 30;

/* set a default mbus format */
imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
- ret = imx_media_init_mbus_fmt(&priv->format_mbus, 640, 480, code,
- V4L2_FIELD_NONE, NULL);
- if (ret)
- return ret;
-
- return media_entity_pads_init(&sd->entity, PRP_NUM_PADS, priv->pad);
+ return imx_media_init_mbus_fmt(&priv->format_mbus, 640, 480, code,
+ V4L2_FIELD_NONE, NULL);
}

static const struct v4l2_subdev_pad_ops prp_pad_ops = {
@@ -487,6 +474,7 @@ static const struct v4l2_subdev_internal_ops prp_internal_ops = {
static int prp_init(struct imx_ic_priv *ic_priv)
{
struct prp_priv *priv;
+ int i;

priv = devm_kzalloc(ic_priv->ipu_dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -496,7 +484,12 @@ static int prp_init(struct imx_ic_priv *ic_priv)
ic_priv->task_priv = priv;
priv->ic_priv = ic_priv;

- return 0;
+ for (i = 0; i < PRP_NUM_PADS; i++)
+ priv->pad[i].flags = (i == PRP_SINK_PAD) ?
+ MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+
+ return media_entity_pads_init(&ic_priv->sd.entity, PRP_NUM_PADS,
+ priv->pad);
}

static void prp_remove(struct imx_ic_priv *ic_priv)
diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index f8a0b21fcd02..09c4e3f33807 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -1240,9 +1240,6 @@ static int prp_s_frame_interval(struct v4l2_subdev *sd,
return 0;
}

-/*
- * retrieve our pads parsed from the OF graph by the media device
- */
static int prp_registered(struct v4l2_subdev *sd)
{
struct prp_priv *priv = sd_to_priv(sd);
@@ -1250,12 +1247,9 @@ static int prp_registered(struct v4l2_subdev *sd)
int i, ret;
u32 code;

+ /* set a default mbus format */
+ imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
for (i = 0; i < PRPENCVF_NUM_PADS; i++) {
- priv->pad[i].flags = (i == PRPENCVF_SINK_PAD) ?
- MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
-
- /* set a default mbus format */
- imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
ret = imx_media_init_mbus_fmt(&priv->format_mbus[i],
640, 480, code, V4L2_FIELD_NONE,
&priv->cc[i]);
@@ -1267,11 +1261,6 @@ static int prp_registered(struct v4l2_subdev *sd)
priv->frame_interval.numerator = 1;
priv->frame_interval.denominator = 30;

- ret = media_entity_pads_init(&sd->entity, PRPENCVF_NUM_PADS,
- priv->pad);
- if (ret)
- return ret;
-
priv->vdev = imx_media_capture_device_init(ic_priv->ipu_dev,
&ic_priv->sd,
PRPENCVF_SRC_PAD);
@@ -1337,6 +1326,7 @@ static const struct v4l2_subdev_internal_ops prp_internal_ops = {
static int prp_init(struct imx_ic_priv *ic_priv)
{
struct prp_priv *priv;
+ int i, ret;

priv = devm_kzalloc(ic_priv->ipu_dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -1350,7 +1340,17 @@ static int prp_init(struct imx_ic_priv *ic_priv)

mutex_init(&priv->lock);

- return 0;
+ for (i = 0; i < PRPENCVF_NUM_PADS; i++) {
+ priv->pad[i].flags = (i == PRPENCVF_SINK_PAD) ?
+ MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+ }
+
+ ret = media_entity_pads_init(&ic_priv->sd.entity, PRPENCVF_NUM_PADS,
+ priv->pad);
+ if (ret)
+ mutex_destroy(&priv->lock);
+
+ return ret;
}

static void prp_remove(struct imx_ic_priv *ic_priv)
diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index b33a07bc9105..c95d2c330a76 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -765,13 +765,6 @@ int imx_media_capture_device_register(struct imx_media_video_dev *vdev)

INIT_LIST_HEAD(&priv->ready_q);

- priv->vdev_pad.flags = MEDIA_PAD_FL_SINK;
- ret = media_entity_pads_init(&vfd->entity, 1, &priv->vdev_pad);
- if (ret) {
- v4l2_err(sd, "failed to init dev pad\n");
- goto unreg;
- }
-
/* create the link from the src_sd devnode pad to device node */
ret = media_create_pad_link(&sd->entity, priv->src_sd_pad,
&vfd->entity, 0, 0);
@@ -834,6 +827,7 @@ imx_media_capture_device_init(struct device *dev, struct v4l2_subdev *src_sd,
{
struct capture_priv *priv;
struct video_device *vfd;
+ int ret;

priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -858,6 +852,13 @@ imx_media_capture_device_init(struct device *dev, struct v4l2_subdev *src_sd,
vfd->queue = &priv->q;
priv->vdev.vfd = vfd;

+ priv->vdev_pad.flags = MEDIA_PAD_FL_SINK;
+ ret = media_entity_pads_init(&vfd->entity, 1, &priv->vdev_pad);
+ if (ret) {
+ video_device_release(vfd);
+ return ERR_PTR(ret);
+ }
+
INIT_LIST_HEAD(&priv->vdev.list);

video_set_drvdata(vfd, priv);
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index b3f1cf08a102..0b320d6e5037 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1740,9 +1740,6 @@ static int csi_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
return v4l2_event_unsubscribe(fh, sub);
}

-/*
- * retrieve our pads parsed from the OF graph by the media device
- */
static int csi_registered(struct v4l2_subdev *sd)
{
struct csi_priv *priv = v4l2_get_subdevdata(sd);
@@ -1759,9 +1756,6 @@ static int csi_registered(struct v4l2_subdev *sd)
priv->csi = csi;

for (i = 0; i < CSI_NUM_PADS; i++) {
- priv->pad[i].flags = (i == CSI_SINK_PAD) ?
- MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
-
code = 0;
if (i != CSI_SINK_PAD)
imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
@@ -1793,10 +1787,6 @@ static int csi_registered(struct v4l2_subdev *sd)
goto put_csi;
}

- ret = media_entity_pads_init(&sd->entity, CSI_NUM_PADS, priv->pad);
- if (ret)
- goto free_fim;
-
priv->vdev = imx_media_capture_device_init(priv->sd.dev,
&priv->sd,
CSI_SRC_PAD_IDMAC);
@@ -1934,7 +1924,7 @@ static int imx_csi_probe(struct platform_device *pdev)
struct ipu_client_platformdata *pdata;
struct pinctrl *pinctrl;
struct csi_priv *priv;
- int ret;
+ int i, ret;

priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -1974,6 +1964,15 @@ static int imx_csi_probe(struct platform_device *pdev)
imx_media_grp_id_to_sd_name(priv->sd.name, sizeof(priv->sd.name),
priv->sd.grp_id, ipu_get_num(priv->ipu));

+ for (i = 0; i < CSI_NUM_PADS; i++)
+ priv->pad[i].flags = (i == CSI_SINK_PAD) ?
+ MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&priv->sd.entity, CSI_NUM_PADS,
+ priv->pad);
+ if (ret)
+ return ret;
+
mutex_init(&priv->lock);

v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
diff --git a/drivers/staging/media/imx/imx-media-vdic.c b/drivers/staging/media/imx/imx-media-vdic.c
index cfad65a16917..0d83c2c41606 100644
--- a/drivers/staging/media/imx/imx-media-vdic.c
+++ b/drivers/staging/media/imx/imx-media-vdic.c
@@ -841,9 +841,6 @@ static int vdic_s_frame_interval(struct v4l2_subdev *sd,
return ret;
}

-/*
- * retrieve our pads parsed from the OF graph by the media device
- */
static int vdic_registered(struct v4l2_subdev *sd)
{
struct vdic_priv *priv = v4l2_get_subdevdata(sd);
@@ -851,9 +848,6 @@ static int vdic_registered(struct v4l2_subdev *sd)
u32 code;

for (i = 0; i < VDIC_NUM_PADS; i++) {
- priv->pad[i].flags = (i == VDIC_SRC_PAD_DIRECT) ?
- MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;
-
code = 0;
if (i != VDIC_SINK_PAD_IDMAC)
imx_media_enum_ipu_format(&code, 0, CS_SEL_YUV);
@@ -874,15 +868,7 @@ static int vdic_registered(struct v4l2_subdev *sd)

priv->active_input_pad = VDIC_SINK_PAD_DIRECT;

- ret = vdic_init_controls(priv);
- if (ret)
- return ret;
-
- ret = media_entity_pads_init(&sd->entity, VDIC_NUM_PADS, priv->pad);
- if (ret)
- v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
-
- return ret;
+ return vdic_init_controls(priv);
}

static void vdic_unregistered(struct v4l2_subdev *sd)
@@ -927,7 +913,7 @@ struct v4l2_subdev *imx_media_vdic_register(struct v4l2_device *v4l2_dev,
u32 grp_id)
{
struct vdic_priv *priv;
- int ret;
+ int i, ret;

priv = devm_kzalloc(ipu_dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -949,6 +935,15 @@ struct v4l2_subdev *imx_media_vdic_register(struct v4l2_device *v4l2_dev,

mutex_init(&priv->lock);

+ for (i = 0; i < VDIC_NUM_PADS; i++)
+ priv->pad[i].flags = (i == VDIC_SRC_PAD_DIRECT) ?
+ MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;
+
+ ret = media_entity_pads_init(&priv->sd.entity, VDIC_NUM_PADS,
+ priv->pad);
+ if (ret)
+ goto free;
+
ret = v4l2_device_register_subdev(v4l2_dev, &priv->sd);
if (ret)
goto free;
diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index bfa4b254c4e4..cd3dd6e33ef0 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -497,26 +497,13 @@ static int csi2_set_fmt(struct v4l2_subdev *sd,
return ret;
}

-/*
- * retrieve our pads parsed from the OF graph by the media device
- */
static int csi2_registered(struct v4l2_subdev *sd)
{
struct csi2_dev *csi2 = sd_to_dev(sd);
- int i, ret;
-
- for (i = 0; i < CSI2_NUM_PADS; i++) {
- csi2->pad[i].flags = (i == CSI2_SINK_PAD) ?
- MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
- }

/* set a default mbus format */
- ret = imx_media_init_mbus_fmt(&csi2->format_mbus,
+ return imx_media_init_mbus_fmt(&csi2->format_mbus,
640, 480, 0, V4L2_FIELD_NONE, NULL);
- if (ret)
- return ret;
-
- return media_entity_pads_init(&sd->entity, CSI2_NUM_PADS, csi2->pad);
}

static const struct media_entity_operations csi2_entity_ops = {
@@ -573,7 +560,7 @@ static int csi2_probe(struct platform_device *pdev)
unsigned int sink_port = 0;
struct csi2_dev *csi2;
struct resource *res;
- int ret;
+ int i, ret;

csi2 = devm_kzalloc(&pdev->dev, sizeof(*csi2), GFP_KERNEL);
if (!csi2)
@@ -592,6 +579,16 @@ static int csi2_probe(struct platform_device *pdev)
csi2->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
csi2->sd.grp_id = IMX_MEDIA_GRP_ID_CSI2;

+ for (i = 0; i < CSI2_NUM_PADS; i++) {
+ csi2->pad[i].flags = (i == CSI2_SINK_PAD) ?
+ MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+ }
+
+ ret = media_entity_pads_init(&csi2->sd.entity, CSI2_NUM_PADS,
+ csi2->pad);
+ if (ret)
+ return ret;
+
csi2->pllref_clk = devm_clk_get(&pdev->dev, "ref");
if (IS_ERR(csi2->pllref_clk)) {
v4l2_err(&csi2->sd, "failed to get pll reference clock\n");
diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index b61ab16a337a..0fe302b89770 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -1100,9 +1100,6 @@ static int imx7_csi_registered(struct v4l2_subdev *sd)
int i;

for (i = 0; i < IMX7_CSI_PADS_NUM; i++) {
- csi->pad[i].flags = (i == IMX7_CSI_PAD_SINK) ?
- MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
-
/* set a default mbus format */
ret = imx_media_init_mbus_fmt(&csi->format_mbus[i],
800, 600, 0, V4L2_FIELD_NONE,
@@ -1115,10 +1112,6 @@ static int imx7_csi_registered(struct v4l2_subdev *sd)
csi->frame_interval[i].denominator = 30;
}

- ret = media_entity_pads_init(&sd->entity, IMX7_CSI_PADS_NUM, csi->pad);
- if (ret < 0)
- return ret;
-
csi->vdev = imx_media_capture_device_init(csi->sd.dev, &csi->sd,
IMX7_CSI_PAD_SRC);
if (IS_ERR(csi->vdev))
@@ -1199,7 +1192,7 @@ static int imx7_csi_probe(struct platform_device *pdev)
struct device_node *node = dev->of_node;
struct imx_media_dev *imxmd;
struct imx7_csi *csi;
- int ret;
+ int i, ret;

csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
if (!csi)
@@ -1266,6 +1259,15 @@ static int imx7_csi_probe(struct platform_device *pdev)
v4l2_ctrl_handler_init(&csi->ctrl_hdlr, 0);
csi->sd.ctrl_handler = &csi->ctrl_hdlr;

+ for (i = 0; i < IMX7_CSI_PADS_NUM; i++)
+ csi->pad[i].flags = (i == IMX7_CSI_PAD_SINK) ?
+ MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&csi->sd.entity, IMX7_CSI_PADS_NUM,
+ csi->pad);
+ if (ret < 0)
+ goto free;
+
ret = v4l2_async_register_fwnode_subdev(&csi->sd,
sizeof(struct v4l2_async_subdev),
NULL, 0,
diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index d1cdf011c8f1..cdf7d0d85042 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -780,17 +780,6 @@ static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}

-static int mipi_csis_registered(struct v4l2_subdev *mipi_sd)
-{
- struct csi_state *state = mipi_sd_to_csis_state(mipi_sd);
-
- state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
- state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
-
- return media_entity_pads_init(&state->mipi_sd.entity, CSIS_PADS_NUM,
- state->pads);
-}
-
static const struct v4l2_subdev_core_ops mipi_csis_core_ops = {
.log_status = mipi_csis_log_status,
};
@@ -816,10 +805,6 @@ static const struct v4l2_subdev_ops mipi_csis_subdev_ops = {
.pad = &mipi_csis_pad_ops,
};

-static const struct v4l2_subdev_internal_ops mipi_csis_internal_ops = {
- .registered = mipi_csis_registered,
-};
-
static int mipi_csis_parse_dt(struct platform_device *pdev,
struct csi_state *state)
{
@@ -880,7 +865,6 @@ static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd,

mipi_sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
mipi_sd->entity.ops = &mipi_csis_entity_ops;
- mipi_sd->internal_ops = &mipi_csis_internal_ops;

mipi_sd->dev = &pdev->dev;

@@ -892,6 +876,13 @@ static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd,

v4l2_set_subdevdata(mipi_sd, &pdev->dev);

+ state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+ state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+ ret = media_entity_pads_init(&mipi_sd->entity, CSIS_PADS_NUM,
+ state->pads);
+ if (ret)
+ return ret;
+
ret = v4l2_async_register_fwnode_subdev(mipi_sd,
sizeof(struct v4l2_async_subdev),
&sink_port, 1,
--
2.17.1
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