media: staging: rkisp1: add serialization to the resizer subdev ops

For subdevices drivers, the drivers themself are responsible
for serializing their operations.
This patch adds serialization to the resizer subdevice.
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/rkisp1/rkisp1-common.h

@@ -226,6 +226,7 @@ struct rkisp1_resizer {
 	struct v4l2_subdev_pad_config pad_cfg[RKISP1_ISP_PAD_MAX];
 	const struct rkisp1_rsz_config *config;
 	enum rkisp1_fmt_pix_type fmt_type;
+	struct mutex ops_lock;
 };
 
 struct rkisp1_debug {

drivers/staging/media/rkisp1/rkisp1-resizer.c

@@ -562,7 +562,9 @@ static int rkisp1_rsz_get_fmt(struct v4l2_subdev *sd,
 	struct rkisp1_resizer *rsz =
 		container_of(sd, struct rkisp1_resizer, sd);
 
+	mutex_lock(&rsz->ops_lock);
 	fmt->format = *rkisp1_rsz_get_pad_fmt(rsz, cfg, fmt->pad, fmt->which);
+	mutex_unlock(&rsz->ops_lock);
 	return 0;
 }
 
@@ -573,11 +575,13 @@ static int rkisp1_rsz_set_fmt(struct v4l2_subdev *sd,
 	struct rkisp1_resizer *rsz =
 		container_of(sd, struct rkisp1_resizer, sd);
 
+	mutex_lock(&rsz->ops_lock);
 	if (fmt->pad == RKISP1_RSZ_PAD_SINK)
 		rkisp1_rsz_set_sink_fmt(rsz, cfg, &fmt->format, fmt->which);
 	else
 		rkisp1_rsz_set_src_fmt(rsz, cfg, &fmt->format, fmt->which);
 
+	mutex_unlock(&rsz->ops_lock);
 	return 0;
 }
 
@@ -588,10 +592,12 @@ static int rkisp1_rsz_get_selection(struct v4l2_subdev *sd,
 	struct rkisp1_resizer *rsz =
 		container_of(sd, struct rkisp1_resizer, sd);
 	struct v4l2_mbus_framefmt *mf_sink;
+	int ret = 0;
 
 	if (sel->pad == RKISP1_RSZ_PAD_SRC)
 		return -EINVAL;
 
+	mutex_lock(&rsz->ops_lock);
 	switch (sel->target) {
 	case V4L2_SEL_TGT_CROP_BOUNDS:
 		mf_sink = rkisp1_rsz_get_pad_fmt(rsz, cfg, RKISP1_RSZ_PAD_SINK,
@@ -606,10 +612,11 @@ static int rkisp1_rsz_get_selection(struct v4l2_subdev *sd,
 						  sel->which);
 		break;
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
 	}
 
-	return 0;
+	mutex_unlock(&rsz->ops_lock);
+	return ret;
 }
 
 static int rkisp1_rsz_set_selection(struct v4l2_subdev *sd,
@@ -625,7 +632,9 @@ static int rkisp1_rsz_set_selection(struct v4l2_subdev *sd,
 	dev_dbg(sd->dev, "%s: pad: %d sel(%d,%d)/%dx%d\n", __func__,
 		sel->pad, sel->r.left, sel->r.top, sel->r.width, sel->r.height);
 
+	mutex_lock(&rsz->ops_lock);
 	rkisp1_rsz_set_sink_crop(rsz, cfg, &sel->r, sel->which);
+	mutex_unlock(&rsz->ops_lock);
 
 	return 0;
 }
@@ -665,9 +674,11 @@ static int rkisp1_rsz_s_stream(struct v4l2_subdev *sd, int enable)
 	if (other->is_streaming)
 		when = RKISP1_SHADOW_REGS_ASYNC;
 
+	mutex_lock(&rsz->ops_lock);
 	rkisp1_rsz_config(rsz, when);
 	rkisp1_dcrop_config(rsz);
 
+	mutex_unlock(&rsz->ops_lock);
 	return 0;
 }
 
@@ -713,6 +724,7 @@ static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
 
 	rsz->fmt_type = RKISP1_DEF_FMT_TYPE;
 
+	mutex_init(&rsz->ops_lock);
 	ret = media_entity_pads_init(&sd->entity, 2, pads);
 	if (ret)
 		return ret;