[2/2] media: rcar_vin: move buffer management to .stop_streaming handler
Commit Message
This commit moves the "buffer in use" logic from the .buf_cleanup
handler into .stop_streaming, based on advice that this is its
proper logical home.
By ensuring the list of pointers in priv->queue_buf[] is managed
as soon as possible, we avoid warnings concerning buffers in ACTIVE
state when the system cleans up after streaming stops. This fixes a
problem with modification of buffers after their content has been
cleared for passing to userspace.
After the refactoring, the buf_init and buf_cleanup functions were
found to contain only initialisation/release steps as are carried out
elsewhere if omitted; these functions and references were removed.
Signed-off-by: William Towle <william.towle@codethink.co.uk>
---
drivers/media/platform/soc_camera/rcar_vin.c | 62 ++++++--------------------
1 file changed, 13 insertions(+), 49 deletions(-)
@@ -480,72 +480,36 @@ static void rcar_vin_wait_stop_streaming(struct rcar_vin_priv *priv)
}
}
-static void rcar_vin_videobuf_release(struct vb2_buffer *vb)
+static void rcar_vin_stop_streaming(struct vb2_queue *vq)
{
- struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
+ struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct rcar_vin_priv *priv = ici->priv;
- unsigned int i;
- int buf_in_use = 0;
+ struct list_head *buf_head, *tmp;
+ int i;
spin_lock_irq(&priv->lock);
+ rcar_vin_wait_stop_streaming(priv);
- /* Is the buffer in use by the VIN hardware? */
for (i = 0; i < MAX_BUFFER_NUM; i++) {
- if (priv->queue_buf[i] == vb) {
- buf_in_use = 1;
- break;
- }
- }
-
- if (buf_in_use) {
- 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
- * release all buffers that are in use by HW
- */
- for (i = 0; i < MAX_BUFFER_NUM; i++) {
- if (priv->queue_buf[i]) {
- vb2_buffer_done(priv->queue_buf[i],
+ if (priv->queue_buf[i]) {
+ vb2_buffer_done(priv->queue_buf[i],
VB2_BUF_STATE_ERROR);
- priv->queue_buf[i] = NULL;
- }
+ priv->queue_buf[i] = NULL;
}
- } else {
- list_del_init(to_buf_list(vb));
}
- spin_unlock_irq(&priv->lock);
-}
-
-static int rcar_vin_videobuf_init(struct vb2_buffer *vb)
-{
- INIT_LIST_HEAD(to_buf_list(vb));
- return 0;
-}
-
-static void rcar_vin_stop_streaming(struct vb2_queue *vq)
-{
- struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
- struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
- struct rcar_vin_priv *priv = ici->priv;
- 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_for_each_safe(buf_head, tmp, &priv->capture) {
+ vb2_buffer_done(&list_entry(buf_head,
+ struct rcar_vin_buffer, list)->vb,
+ VB2_BUF_STATE_ERROR);
list_del_init(buf_head);
-
+ }
spin_unlock_irq(&priv->lock);
}
static struct vb2_ops rcar_vin_vb2_ops = {
.queue_setup = rcar_vin_videobuf_setup,
- .buf_init = rcar_vin_videobuf_init,
- .buf_cleanup = rcar_vin_videobuf_release,
.buf_queue = rcar_vin_videobuf_queue,
.stop_streaming = rcar_vin_stop_streaming,
.wait_prepare = soc_camera_unlock,