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[media] rcar_vin: move buffer management to .stop_streaming handler

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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>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
William Towle 2015-01-26 14:08:40 -03:00 committed by Mauro Carvalho Chehab
parent 4abec46833
commit e99f0115e5
1 changed files with 15 additions and 51 deletions
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66
drivers/media/platform/soc_camera/rcar_vin.c
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@ -826,72 +826,36 @@ static void rcar_vin_wait_stop_streaming(struct rcar_vin_priv *priv)
}
}
static void rcar_vin_videobuf_release(struct vb2_buffer *vb)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
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;
spin_lock_irq(&priv->lock);
/* 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],
VB2_BUF_STATE_ERROR);
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;
int i;
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);
for (i = 0; i < MAX_BUFFER_NUM; i++) {
if (priv->queue_buf[i]) {
vb2_buffer_done(priv->queue_buf[i],
VB2_BUF_STATE_ERROR);
priv->queue_buf[i] = NULL;
}
}
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 = vb2_ops_wait_prepare,