[1/2] media: rcar_vin: helper function for streaming stop
Commit Message
From: Ian Molton <ian.molton@codethink.co.uk>
The code that tests that capture from a stream has stopped is
presently insufficient and the potential for a race condition
exists where frame capture may generate an interrupt between
requesting the capture process halt and freeing buffers.
This patch refactors code out of rcar_vin_videobuf_release() and
into rcar_vin_wait_stop_streaming(), and ensures there are calls
in places where we need to know that capturing has finished.
Signed-off-by: Ian Molton <ian.molton@codethink.co.uk>
Signed-off-by: William Towle <william.towle@codethink.co.uk>
---
drivers/media/platform/soc_camera/rcar_vin.c | 41 +++++++++++++++++---------
1 file changed, 27 insertions(+), 14 deletions(-)
@@ -458,6 +458,28 @@ error:
vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
}
+/*
+ * Wait for capture to stop and all in-flight buffers to be finished with by
+ * the video hardware. This must be called under &priv->lock
+ *
+ */
+static void rcar_vin_wait_stop_streaming(struct rcar_vin_priv *priv)
+{
+ while (priv->state != STOPPED) {
+ /* issue stop if running */
+ if (priv->state == RUNNING)
+ rcar_vin_request_capture_stop(priv);
+
+ /* wait until capturing has been stopped */
+ if (priv->state == STOPPING) {
+ priv->request_to_stop = true;
+ spin_unlock_irq(&priv->lock);
+ wait_for_completion(&priv->capture_stop);
+ spin_lock_irq(&priv->lock);
+ }
+ }
+}
+
static void rcar_vin_videobuf_release(struct vb2_buffer *vb)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
@@ -477,20 +499,8 @@ static void rcar_vin_videobuf_release(struct vb2_buffer *vb)
}
if (buf_in_use) {
- while (priv->state != STOPPED) {
-
- /* issue stop if running */
- if (priv->state == RUNNING)
- rcar_vin_request_capture_stop(priv);
-
- /* wait until capturing has been stopped */
- if (priv->state == STOPPING) {
- priv->request_to_stop = true;
- spin_unlock_irq(&priv->lock);
- wait_for_completion(&priv->capture_stop);
- spin_lock_irq(&priv->lock);
- }
- }
+ rcar_vin_wait_stop_streaming(priv);
+
/*
* Capturing has now stopped. The buffer we have been asked
* to release could be any of the current buffers in use, so
@@ -524,8 +534,11 @@ static void rcar_vin_stop_streaming(struct vb2_queue *vq)
struct list_head *buf_head, *tmp;
spin_lock_irq(&priv->lock);
+
+ rcar_vin_wait_stop_streaming(priv);
list_for_each_safe(buf_head, tmp, &priv->capture)
list_del_init(buf_head);
+
spin_unlock_irq(&priv->lock);
}