[media] v4l: Allow changing control handler lock
Allow choosing the lock used by the control handler. This may be handy sometimes when a driver providing multiple subdevs does not want to use several locks to serialise its functions. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
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8227c92b69
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77e7c4e624
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@ -281,19 +281,19 @@ adp1653_init_device(struct adp1653_flash *flash)
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return -EIO;
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}
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mutex_lock(&flash->ctrls.lock);
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mutex_lock(flash->ctrls.lock);
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/* Reset faults before reading new ones. */
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flash->fault = 0;
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rval = adp1653_get_fault(flash);
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mutex_unlock(&flash->ctrls.lock);
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mutex_unlock(flash->ctrls.lock);
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if (rval > 0) {
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dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval);
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return -EIO;
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}
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mutex_lock(&flash->ctrls.lock);
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mutex_lock(flash->ctrls.lock);
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rval = adp1653_update_hw(flash);
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mutex_unlock(&flash->ctrls.lock);
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mutex_unlock(flash->ctrls.lock);
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if (rval) {
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dev_err(&client->dev,
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"adp1653_update_hw failed at %s\n", __func__);
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@ -1177,7 +1177,8 @@ static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
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int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
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unsigned nr_of_controls_hint)
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{
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mutex_init(&hdl->lock);
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hdl->lock = &hdl->_lock;
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mutex_init(hdl->lock);
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INIT_LIST_HEAD(&hdl->ctrls);
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INIT_LIST_HEAD(&hdl->ctrl_refs);
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hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
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@ -1198,7 +1199,7 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
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if (hdl == NULL || hdl->buckets == NULL)
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return;
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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/* Free all nodes */
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list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
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list_del(&ref->node);
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@ -1215,7 +1216,7 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
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hdl->buckets = NULL;
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hdl->cached = NULL;
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hdl->error = 0;
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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}
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EXPORT_SYMBOL(v4l2_ctrl_handler_free);
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@ -1280,9 +1281,9 @@ static struct v4l2_ctrl_ref *find_ref_lock(
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struct v4l2_ctrl_ref *ref = NULL;
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if (hdl) {
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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ref = find_ref(hdl, id);
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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}
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return ref;
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}
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@ -1329,7 +1330,7 @@ static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
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INIT_LIST_HEAD(&new_ref->node);
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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/* Add immediately at the end of the list if the list is empty, or if
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the last element in the list has a lower ID.
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@ -1359,7 +1360,7 @@ insert_in_hash:
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hdl->buckets[bucket] = new_ref;
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unlock:
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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return 0;
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}
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@ -1445,9 +1446,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
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kfree(ctrl);
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return NULL;
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}
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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list_add_tail(&ctrl->node, &hdl->ctrls);
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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return ctrl;
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}
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@ -1564,7 +1565,7 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
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return 0;
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if (hdl->error)
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return hdl->error;
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mutex_lock(&add->lock);
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mutex_lock(add->lock);
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list_for_each_entry(ref, &add->ctrl_refs, node) {
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struct v4l2_ctrl *ctrl = ref->ctrl;
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@ -1578,7 +1579,7 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
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if (ret)
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break;
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}
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mutex_unlock(&add->lock);
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mutex_unlock(add->lock);
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return ret;
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}
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EXPORT_SYMBOL(v4l2_ctrl_add_handler);
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@ -1742,11 +1743,11 @@ void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
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len = strlen(prefix);
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if (len && prefix[len - 1] != ' ')
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colon = ": ";
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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list_for_each_entry(ctrl, &hdl->ctrls, node)
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if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
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log_ctrl(ctrl, prefix, colon);
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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}
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EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
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@ -1758,7 +1759,7 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
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if (hdl == NULL)
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return 0;
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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list_for_each_entry(ctrl, &hdl->ctrls, node)
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ctrl->done = false;
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@ -1783,7 +1784,7 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
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if (ret)
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break;
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}
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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return ret;
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}
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EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
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@ -1798,7 +1799,7 @@ int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
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if (hdl == NULL)
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return -EINVAL;
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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/* Try to find it */
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ref = find_ref(hdl, id);
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@ -1823,7 +1824,7 @@ int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
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break;
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}
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}
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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if (!ref)
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return -EINVAL;
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@ -2000,7 +2001,7 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
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belong to the same cluster. */
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/* This has to be done with the handler lock taken. */
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mutex_lock(&hdl->lock);
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mutex_lock(hdl->lock);
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/* First zero the helper field in the master control references */
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for (i = 0; i < cs->count; i++)
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@ -2022,7 +2023,7 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
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/* Point the mref helper to the current helper struct. */
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mref->helper = h;
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}
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mutex_unlock(&hdl->lock);
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mutex_unlock(hdl->lock);
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return 0;
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}
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@ -485,7 +485,7 @@ static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
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gen_text(dev, vbuf, line++ * 16, 16, str);
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gain = v4l2_ctrl_g_ctrl(dev->gain);
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mutex_lock(&dev->ctrl_handler.lock);
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mutex_lock(dev->ctrl_handler.lock);
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snprintf(str, sizeof(str), " brightness %3d, contrast %3d, saturation %3d, hue %d ",
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dev->brightness->cur.val,
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dev->contrast->cur.val,
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@ -509,7 +509,7 @@ static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
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dev->int_menu->qmenu_int[dev->int_menu->cur.val],
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dev->int_menu->cur.val);
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gen_text(dev, vbuf, line++ * 16, 16, str);
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mutex_unlock(&dev->ctrl_handler.lock);
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mutex_unlock(dev->ctrl_handler.lock);
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if (dev->button_pressed) {
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dev->button_pressed--;
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snprintf(str, sizeof(str), " button pressed!");
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@ -167,7 +167,9 @@ struct v4l2_ctrl_ref {
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/** struct v4l2_ctrl_handler - The control handler keeps track of all the
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* controls: both the controls owned by the handler and those inherited
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* from other handlers.
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* @_lock: Default for "lock".
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* @lock: Lock to control access to this handler and its controls.
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* May be replaced by the user right after init.
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* @ctrls: The list of controls owned by this handler.
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* @ctrl_refs: The list of control references.
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* @cached: The last found control reference. It is common that the same
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@ -178,7 +180,8 @@ struct v4l2_ctrl_ref {
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* @error: The error code of the first failed control addition.
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*/
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struct v4l2_ctrl_handler {
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struct mutex lock;
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struct mutex _lock;
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struct mutex *lock;
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struct list_head ctrls;
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struct list_head ctrl_refs;
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struct v4l2_ctrl_ref *cached;
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@ -455,7 +458,7 @@ void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
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*/
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static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
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{
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mutex_lock(&ctrl->handler->lock);
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mutex_lock(ctrl->handler->lock);
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}
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/** v4l2_ctrl_lock() - Helper function to unlock the handler
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@ -464,7 +467,7 @@ static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
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*/
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static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
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{
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mutex_unlock(&ctrl->handler->lock);
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mutex_unlock(ctrl->handler->lock);
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}
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/** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver.
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