From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
The v4l2_ctrl_fh struct connected v4l2_ctrl with v4l2_fh so the control
would know which filehandles subscribed to it. However, it is much easier
to use struct v4l2_subscribed_event directly for that and get rid of that
intermediate struct.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/video/v4l2-ctrls.c | 50 ++++++++++++++-----------------------
drivers/media/video/v4l2-event.c | 34 +++++++++----------------
include/media/v4l2-ctrls.h | 17 +++++-------
include/media/v4l2-event.h | 9 +++++++
4 files changed, 47 insertions(+), 63 deletions(-)
diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index f581910..079f952 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -581,15 +581,15 @@ static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 change
static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
{
struct v4l2_event ev;
- struct v4l2_ctrl_fh *pos;
+ struct v4l2_subscribed_event *sev;
- if (list_empty(&ctrl->fhs))
+ if (list_empty(&ctrl->ev_subs))
return;
fill_event(&ev, ctrl, changes);
- list_for_each_entry(pos, &ctrl->fhs, node)
- if (pos->fh != fh)
- v4l2_event_queue_fh(pos->fh, &ev);
+ list_for_each_entry(sev, &ctrl->ev_subs, node)
+ if (sev->fh && sev->fh != fh)
+ v4l2_event_queue_fh(sev->fh, &ev);
}
/* Helper function: copy the current control value back to the caller */
@@ -867,7 +867,7 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
{
struct v4l2_ctrl_ref *ref, *next_ref;
struct v4l2_ctrl *ctrl, *next_ctrl;
- struct v4l2_ctrl_fh *ctrl_fh, *next_ctrl_fh;
+ struct v4l2_subscribed_event *sev, *next_sev;
if (hdl == NULL || hdl->buckets == NULL)
return;
@@ -881,10 +881,8 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
/* Free all controls owned by the handler */
list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
list_del(&ctrl->node);
- list_for_each_entry_safe(ctrl_fh, next_ctrl_fh, &ctrl->fhs, node) {
- list_del(&ctrl_fh->node);
- kfree(ctrl_fh);
- }
+ list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node)
+ list_del(&sev->node);
kfree(ctrl);
}
kfree(hdl->buckets);
@@ -1084,7 +1082,7 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
}
INIT_LIST_HEAD(&ctrl->node);
- INIT_LIST_HEAD(&ctrl->fhs);
+ INIT_LIST_HEAD(&ctrl->ev_subs);
ctrl->handler = hdl;
ctrl->ops = ops;
ctrl->id = id;
@@ -2027,41 +2025,31 @@ int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
}
EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
-void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
- struct v4l2_ctrl_fh *ctrl_fh,
- struct v4l2_event_subscription *sub)
+void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
+ struct v4l2_subscribed_event *sev)
{
- struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, sub->id);
-
v4l2_ctrl_lock(ctrl);
- list_add_tail(&ctrl_fh->node, &ctrl->fhs);
+ list_add_tail(&sev->node, &ctrl->ev_subs);
if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
- (sub->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
+ (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
struct v4l2_event ev;
fill_event(&ev, ctrl, V4L2_EVENT_CTRL_CH_VALUE |
V4L2_EVENT_CTRL_CH_FLAGS);
- v4l2_event_queue_fh(ctrl_fh->fh, &ev);
+ v4l2_event_queue_fh(sev->fh, &ev);
}
v4l2_ctrl_unlock(ctrl);
}
-EXPORT_SYMBOL(v4l2_ctrl_add_fh);
+EXPORT_SYMBOL(v4l2_ctrl_add_event);
-void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh)
+void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
+ struct v4l2_subscribed_event *sev)
{
- struct v4l2_ctrl_fh *pos;
-
v4l2_ctrl_lock(ctrl);
- list_for_each_entry(pos, &ctrl->fhs, node) {
- if (pos->fh == fh) {
- list_del(&pos->node);
- kfree(pos);
- break;
- }
- }
+ list_del(&sev->node);
v4l2_ctrl_unlock(ctrl);
}
-EXPORT_SYMBOL(v4l2_ctrl_del_fh);
+EXPORT_SYMBOL(v4l2_ctrl_del_event);
int v4l2_ctrl_subscribe_fh(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub, unsigned n)
diff --git a/drivers/media/video/v4l2-event.c b/drivers/media/video/v4l2-event.c
index 70fa82d..dc68f60 100644
--- a/drivers/media/video/v4l2-event.c
+++ b/drivers/media/video/v4l2-event.c
@@ -213,7 +213,6 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
{
struct v4l2_subscribed_event *sev, *found_ev;
struct v4l2_ctrl *ctrl = NULL;
- struct v4l2_ctrl_fh *ctrl_fh = NULL;
unsigned long flags;
if (sub->type == V4L2_EVENT_CTRL) {
@@ -222,17 +221,9 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
return -EINVAL;
}
- sev = kmalloc(sizeof(*sev), GFP_KERNEL);
+ sev = kzalloc(sizeof(*sev), GFP_KERNEL);
if (!sev)
return -ENOMEM;
- if (ctrl) {
- ctrl_fh = kzalloc(sizeof(*ctrl_fh), GFP_KERNEL);
- if (!ctrl_fh) {
- kfree(sev);
- return -ENOMEM;
- }
- ctrl_fh->fh = fh;
- }
spin_lock_irqsave(&fh->vdev->fh_lock, flags);
@@ -241,22 +232,19 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
INIT_LIST_HEAD(&sev->list);
sev->type = sub->type;
sev->id = sub->id;
+ sev->fh = fh;
+ sev->flags = sub->flags;
list_add(&sev->list, &fh->subscribed);
- sev = NULL;
}
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
/* v4l2_ctrl_add_fh uses a mutex, so do this outside the spin lock */
- if (ctrl) {
- if (found_ev)
- kfree(ctrl_fh);
- else
- v4l2_ctrl_add_fh(fh->ctrl_handler, ctrl_fh, sub);
- }
-
- kfree(sev);
+ if (found_ev)
+ kfree(sev);
+ else if (ctrl)
+ v4l2_ctrl_add_event(ctrl, sev);
return 0;
}
@@ -298,15 +286,17 @@ int v4l2_event_unsubscribe(struct v4l2_fh *fh,
spin_lock_irqsave(&fh->vdev->fh_lock, flags);
sev = v4l2_event_subscribed(fh, sub->type, sub->id);
- if (sev != NULL)
+ if (sev != NULL) {
list_del(&sev->list);
+ sev->fh = NULL;
+ }
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
- if (sev->type == V4L2_EVENT_CTRL) {
+ if (sev && sev->type == V4L2_EVENT_CTRL) {
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(fh->ctrl_handler, sev->id);
if (ctrl)
- v4l2_ctrl_del_fh(ctrl, fh);
+ v4l2_ctrl_del_event(ctrl, sev);
}
kfree(sev);
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index de68a59..635adc2 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -31,6 +31,7 @@ struct v4l2_ctrl;
struct video_device;
struct v4l2_subdev;
struct v4l2_event_subscription;
+struct v4l2_subscribed_event;
struct v4l2_fh;
/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
@@ -53,6 +54,7 @@ struct v4l2_ctrl_ops {
/** struct v4l2_ctrl - The control structure.
* @node: The list node.
+ * @ev_subs: The list of control event subscriptions.
* @handler: The handler that owns the control.
* @cluster: Point to start of cluster array.
* @ncontrols: Number of controls in cluster array.
@@ -108,7 +110,7 @@ struct v4l2_ctrl_ops {
struct v4l2_ctrl {
/* Administrative fields */
struct list_head node;
- struct list_head fhs;
+ struct list_head ev_subs;
struct v4l2_ctrl_handler *handler;
struct v4l2_ctrl **cluster;
unsigned ncontrols;
@@ -184,11 +186,6 @@ struct v4l2_ctrl_handler {
int error;
};
-struct v4l2_ctrl_fh {
- struct list_head node;
- struct v4l2_fh *fh;
-};
-
/** struct v4l2_ctrl_config - Control configuration structure.
* @ops: The control ops.
* @id: The control ID.
@@ -497,10 +494,10 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
/* Internal helper functions that deal with control events. */
-void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
- struct v4l2_ctrl_fh *ctrl_fh,
- struct v4l2_event_subscription *sub);
-void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh);
+void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
+ struct v4l2_subscribed_event *sev);
+void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
+ struct v4l2_subscribed_event *sev);
/** v4l2_ctrl_subscribe_fh() - Helper function that subscribes a control event.
* @fh: The file handler that subscribed the control event.
diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h
index 042b893..eda17f8 100644
--- a/include/media/v4l2-event.h
+++ b/include/media/v4l2-event.h
@@ -38,9 +38,18 @@ struct v4l2_kevent {
};
struct v4l2_subscribed_event {
+ /* list node for the v4l2_fh->subscribed list */
struct list_head list;
+ /* event type */
u32 type;
+ /* associated object ID (e.g. control ID) */
u32 id;
+ /* copy of v4l2_event_subscription->flags */
+ u32 flags;
+ /* filehandle that subscribed to this event */
+ struct v4l2_fh *fh;
+ /* list node that hooks into the object's event list (if there is one) */
+ struct list_head node;
};
int v4l2_event_alloc(struct v4l2_fh *fh, unsigned int n);
--
1.7.1
--
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