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[PATCH/RFC,33/48] vb2: Add helper function to check for request buffers

Message ID 1450341626-6695-34-git-send-email-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State RFC
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Laurent Pinchart Dec. 17, 2015, 8:40 a.m. UTC 
The vb2_queue_has_request() function will check whether a buffer has
been prepared for the given request ID.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/media/v4l2-core/videobuf2-v4l2.c | 17 +++++++++++++++++
 include/media/videobuf2-v4l2.h           |  2 ++
 2 files changed, 19 insertions(+)
diff mbox

Patch

diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c b/drivers/media/v4l2-core/videobuf2-v4l2.c
index 2c8776891535..0db7d67092ab 100644
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -753,6 +753,23 @@  void vb2_queue_release(struct vb2_queue *q)
 }
 EXPORT_SYMBOL_GPL(vb2_queue_release);
 
+bool vb2_queue_has_request(struct vb2_queue *q, unsigned int request)
+{
+	unsigned int i;
+
+	for (i = 0; i < q->num_buffers; i++) {
+		struct vb2_buffer *vb = q->bufs[i];
+		struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+
+		if (vb->state == VB2_BUF_STATE_PREPARED &&
+		    vbuf->request == request)
+			return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(vb2_queue_has_request);
+
 /**
  * vb2_poll() - implements poll userspace operation
  * @q:		videobuf2 queue
diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index 48d6a34dcdb4..7cb428fc66ad 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -68,6 +68,8 @@  int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
 int __must_check vb2_queue_init(struct vb2_queue *q);
 void vb2_queue_release(struct vb2_queue *q);
 
+bool vb2_queue_has_request(struct vb2_queue *q, unsigned int request);
+
 unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
 size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
 		loff_t *ppos, int nonblock);