media: atomisp: Drop atomisp_init_pipe()

atomisp_init_pipe() does 3 things:

1. Init a bunch of list-heads / locks
2. Init the vb_queue for the videodev (aka pipe)
3. zero the per-frame parameters related variables of the pipe

1. and 2. really should not be done at file-open time, but once at probe.
Currently the code is getting away with doing this on every videodev-open
because only 1 open is allowed at a time.

1. is already done at probe time by atomisp_init_subdev_pipe(), move 2. to
atomisp_init_subdev_pipe() so that it is also done once at probe.

As for 3. The per-frame parameters can only be set from a qbuf ioctl,
which can only happen after a reqbufs ioctl and atomisp_buf_cleanup
already zeros the per-frame parameters when the buffers are released,
so 3. is not necessary at all.
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_fops.c

@@ -624,7 +624,7 @@ static void atomisp_buf_cleanup(struct vb2_buffer *vb)
 	hmm_free(frame->data);
 }
 
-static const struct vb2_ops atomisp_vb2_ops = {
+const struct vb2_ops atomisp_vb2_ops = {
 	.queue_setup		= atomisp_queue_setup,
 	.buf_init		= atomisp_buf_init,
 	.buf_cleanup		= atomisp_buf_cleanup,
@@ -633,40 +633,6 @@ static const struct vb2_ops atomisp_vb2_ops = {
 	.stop_streaming		= atomisp_stop_streaming,
 };
 
-static int atomisp_init_pipe(struct atomisp_video_pipe *pipe)
-{
-	int ret;
-
-	/* init locks */
-	spin_lock_init(&pipe->irq_lock);
-	mutex_init(&pipe->vb_queue_mutex);
-
-	/* Init videobuf2 queue structure */
-	pipe->vb_queue.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	pipe->vb_queue.io_modes = VB2_MMAP | VB2_USERPTR;
-	pipe->vb_queue.buf_struct_size = sizeof(struct ia_css_frame);
-	pipe->vb_queue.ops = &atomisp_vb2_ops;
-	pipe->vb_queue.mem_ops = &vb2_vmalloc_memops;
-	pipe->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-	ret = vb2_queue_init(&pipe->vb_queue);
-	if (ret)
-		return ret;
-
-	pipe->vdev.queue = &pipe->vb_queue;
-	pipe->vdev.queue->lock = &pipe->vb_queue_mutex;
-
-	INIT_LIST_HEAD(&pipe->activeq);
-	INIT_LIST_HEAD(&pipe->buffers_waiting_for_param);
-	INIT_LIST_HEAD(&pipe->per_frame_params);
-	memset(pipe->frame_request_config_id, 0,
-	       VIDEO_MAX_FRAME * sizeof(unsigned int));
-	memset(pipe->frame_params, 0,
-	       VIDEO_MAX_FRAME *
-	       sizeof(struct atomisp_css_params_with_list *));
-
-	return 0;
-}
-
 static void atomisp_dev_init_struct(struct atomisp_device *isp)
 {
 	unsigned int i;
@@ -773,10 +739,6 @@ static int atomisp_open(struct file *file)
 		return -EBUSY;
 	}
 
-	ret = atomisp_init_pipe(pipe);
-	if (ret)
-		goto error;
-
 	if (atomisp_dev_users(isp)) {
 		dev_dbg(isp->dev, "skip init isp in open\n");
 		goto init_subdev;

drivers/staging/media/atomisp/pci/atomisp_fops.h

@@ -31,6 +31,7 @@ unsigned int atomisp_sub_dev_users(struct atomisp_sub_device *asd);
 
 int atomisp_qbuffers_to_css(struct atomisp_sub_device *asd);
 
+extern const struct vb2_ops atomisp_vb2_ops;
 extern const struct v4l2_file_operations atomisp_fops;
 
 #endif /* __ATOMISP_FOPS_H__ */

drivers/staging/media/atomisp/pci/atomisp_subdev.c

@@ -25,9 +25,11 @@
 
 #include <media/v4l2-event.h>
 #include <media/v4l2-mediabus.h>
+#include <media/videobuf2-vmalloc.h>
 #include "atomisp_cmd.h"
 #include "atomisp_common.h"
 #include "atomisp_compat.h"
+#include "atomisp_fops.h"
 #include "atomisp_internal.h"
 
 const struct atomisp_in_fmt_conv atomisp_in_fmt_conv[] = {
@@ -1023,14 +1025,31 @@ static const struct v4l2_ctrl_config ctrl_depth_mode = {
 	.def = 0,
 };
 
-static void atomisp_init_subdev_pipe(struct atomisp_sub_device *asd,
-				     struct atomisp_video_pipe *pipe, enum v4l2_buf_type buf_type)
+static int atomisp_init_subdev_pipe(struct atomisp_sub_device *asd,
+				    struct atomisp_video_pipe *pipe, enum v4l2_buf_type buf_type)
 {
+	int ret;
+
 	pipe->type = buf_type;
 	pipe->asd = asd;
 	pipe->isp = asd->isp;
 	spin_lock_init(&pipe->irq_lock);
 	mutex_init(&pipe->vb_queue_mutex);
+
+	/* Init videobuf2 queue structure */
+	pipe->vb_queue.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	pipe->vb_queue.io_modes = VB2_MMAP | VB2_USERPTR;
+	pipe->vb_queue.buf_struct_size = sizeof(struct ia_css_frame);
+	pipe->vb_queue.ops = &atomisp_vb2_ops;
+	pipe->vb_queue.mem_ops = &vb2_vmalloc_memops;
+	pipe->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	ret = vb2_queue_init(&pipe->vb_queue);
+	if (ret)
+		return ret;
+
+	pipe->vdev.queue = &pipe->vb_queue;
+	pipe->vdev.queue->lock = &pipe->vb_queue_mutex;
+
 	INIT_LIST_HEAD(&pipe->buffers_in_css);
 	INIT_LIST_HEAD(&pipe->activeq);
 	INIT_LIST_HEAD(&pipe->buffers_waiting_for_param);
@@ -1040,6 +1059,8 @@ static void atomisp_init_subdev_pipe(struct atomisp_sub_device *asd,
 	memset(pipe->frame_params,
 	       0, VIDEO_MAX_FRAME *
 	       sizeof(struct atomisp_css_params_with_list *));
+
+	return 0;
 }
 
 /*
@@ -1085,17 +1106,25 @@ static int isp_subdev_init_entities(struct atomisp_sub_device *asd)
 	if (ret < 0)
 		return ret;
 
-	atomisp_init_subdev_pipe(asd, &asd->video_out_preview,
-				 V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	ret = atomisp_init_subdev_pipe(asd, &asd->video_out_preview,
+				       V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	if (ret)
+		return ret;
 
-	atomisp_init_subdev_pipe(asd, &asd->video_out_vf,
-				 V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	ret = atomisp_init_subdev_pipe(asd, &asd->video_out_vf,
+				       V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	if (ret)
+		return ret;
 
-	atomisp_init_subdev_pipe(asd, &asd->video_out_capture,
-				 V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	ret = atomisp_init_subdev_pipe(asd, &asd->video_out_capture,
+				       V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	if (ret)
+		return ret;
 
-	atomisp_init_subdev_pipe(asd, &asd->video_out_video_capture,
-				 V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	ret = atomisp_init_subdev_pipe(asd, &asd->video_out_video_capture,
+				       V4L2_BUF_TYPE_VIDEO_CAPTURE);
+	if (ret)
+		return ret;
 
 	ret = atomisp_video_init(&asd->video_out_capture, "CAPTURE",
 				 ATOMISP_RUN_MODE_STILL_CAPTURE);