Merge tag 'rpmsg-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc

Pull rpmsg updates from Bjorn Andersson:
 "This introduces rpmsg_char support for GLINK and fixes a few issues"

* tag 'rpmsg-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc:
  rpmsg: glink: Expose rpmsg name attr for glink
  rpmsg: glink: Add support for rpmsg glink chrdev
  rpmsg: Guard against null endpoint ops in destroy
  rpmsg: glink: Use complete_all for open states
  rpmsg: virtio: fix compilation warning for virtio_rpmsg_channel description
  rpmsg: Avoid double-free in mtk_rpmsg_register_device
  rpmsg: smd: Fix a kobj leak in in qcom_smd_parse_edge()

5 files changed, 97 insertions, 23 deletions

diff --git a/drivers/rpmsg/mtk_rpmsg.c b/drivers/rpmsg/mtk_rpmsg.c
index 83f2b8804ee9..96a17ec29140 100644
--- a/drivers/rpmsg/mtk_rpmsg.c
+++ b/drivers/rpmsg/mtk_rpmsg.c
@@ -200,7 +200,6 @@ static int mtk_rpmsg_register_device(struct mtk_rpmsg_rproc_subdev *mtk_subdev,
 	struct rpmsg_device *rpdev;
 	struct mtk_rpmsg_device *mdev;
 	struct platform_device *pdev = mtk_subdev->pdev;
-	int ret;
 
 	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
 	if (!mdev)
@@ -219,13 +218,7 @@ static int mtk_rpmsg_register_device(struct mtk_rpmsg_rproc_subdev *mtk_subdev,
 	rpdev->dev.parent = &pdev->dev;
 	rpdev->dev.release = mtk_rpmsg_release_device;
 
-	ret = rpmsg_register_device(rpdev);
-	if (ret) {
-		kfree(mdev);
-		return ret;
-	}
-
-	return 0;
+	return rpmsg_register_device(rpdev);
 }
 
 static void mtk_register_device_work_function(struct work_struct *register_work)
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index f40312b16da0..27a05167c18c 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -970,7 +970,7 @@ static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
 		return -EINVAL;
 	}
 
-	complete(&channel->open_ack);
+	complete_all(&channel->open_ack);
 
 	return 0;
 }
@@ -1178,7 +1178,7 @@ static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
 	__be32 *val = defaults;
 	int size;
 
-	if (glink->intentless)
+	if (glink->intentless || !completion_done(&channel->open_ack))
 		return 0;
 
 	prop = of_find_property(np, "qcom,intents", NULL);
@@ -1413,7 +1413,7 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
 	channel->rcid = ret;
 	spin_unlock_irqrestore(&glink->idr_lock, flags);
 
-	complete(&channel->open_req);
+	complete_all(&channel->open_req);
 
 	if (create_device) {
 		rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
@@ -1574,6 +1574,60 @@ static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
 		kfree(dcmd);
 }
 
+static ssize_t rpmsg_name_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int ret = 0;
+	const char *name;
+
+	ret = of_property_read_string(dev->of_node, "label", &name);
+	if (ret < 0)
+		name = dev->of_node->name;
+
+	return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name);
+}
+static DEVICE_ATTR_RO(rpmsg_name);
+
+static struct attribute *qcom_glink_attrs[] = {
+	&dev_attr_rpmsg_name.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(qcom_glink);
+
+static void qcom_glink_device_release(struct device *dev)
+{
+	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+	struct glink_channel *channel = to_glink_channel(rpdev->ept);
+
+	/* Release qcom_glink_alloc_channel() reference */
+	kref_put(&channel->refcount, qcom_glink_channel_release);
+	kfree(rpdev);
+}
+
+static int qcom_glink_create_chrdev(struct qcom_glink *glink)
+{
+	struct rpmsg_device *rpdev;
+	struct glink_channel *channel;
+
+	rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
+	if (!rpdev)
+		return -ENOMEM;
+
+	channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev");
+	if (IS_ERR(channel)) {
+		kfree(rpdev);
+		return PTR_ERR(channel);
+	}
+	channel->rpdev = rpdev;
+
+	rpdev->ept = &channel->ept;
+	rpdev->ops = &glink_device_ops;
+	rpdev->dev.parent = glink->dev;
+	rpdev->dev.release = qcom_glink_device_release;
+
+	return rpmsg_chrdev_register_device(rpdev);
+}
+
 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 					   unsigned long features,
 					   struct qcom_glink_pipe *rx,
@@ -1604,6 +1658,12 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 	idr_init(&glink->lcids);
 	idr_init(&glink->rcids);
 
+	glink->dev->groups = qcom_glink_groups;
+
+	ret = device_add_groups(dev, qcom_glink_groups);
+	if (ret)
+		dev_err(dev, "failed to add groups\n");
+
 	ret = of_property_read_string(dev->of_node, "label", &glink->name);
 	if (ret < 0)
 		glink->name = dev->of_node->name;
@@ -1633,6 +1693,10 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 	if (ret)
 		return ERR_PTR(ret);
 
+	ret = qcom_glink_create_chrdev(glink);
+	if (ret)
+		dev_err(glink->dev, "failed to register chrdev\n");
+
 	return glink;
 }
 EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 4abbeea782fa..19903de6268d 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -1338,7 +1338,7 @@ static int qcom_smd_parse_edge(struct device *dev,
 	ret = of_property_read_u32(node, key, &edge->edge_id);
 	if (ret) {
 		dev_err(dev, "edge missing %s property\n", key);
-		return -EINVAL;
+		goto put_node;
 	}
 
 	edge->remote_pid = QCOM_SMEM_HOST_ANY;
@@ -1349,32 +1349,37 @@ static int qcom_smd_parse_edge(struct device *dev,
 	edge->mbox_client.knows_txdone = true;
 	edge->mbox_chan = mbox_request_channel(&edge->mbox_client, 0);
 	if (IS_ERR(edge->mbox_chan)) {
-		if (PTR_ERR(edge->mbox_chan) != -ENODEV)
-			return PTR_ERR(edge->mbox_chan);
+		if (PTR_ERR(edge->mbox_chan) != -ENODEV) {
+			ret = PTR_ERR(edge->mbox_chan);
+			goto put_node;
+		}
 
 		edge->mbox_chan = NULL;
 
 		syscon_np = of_parse_phandle(node, "qcom,ipc", 0);
 		if (!syscon_np) {
 			dev_err(dev, "no qcom,ipc node\n");
-			return -ENODEV;
+			ret = -ENODEV;
+			goto put_node;
 		}
 
 		edge->ipc_regmap = syscon_node_to_regmap(syscon_np);
-		if (IS_ERR(edge->ipc_regmap))
-			return PTR_ERR(edge->ipc_regmap);
+		if (IS_ERR(edge->ipc_regmap)) {
+			ret = PTR_ERR(edge->ipc_regmap);
+			goto put_node;
+		}
 
 		key = "qcom,ipc";
 		ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset);
 		if (ret < 0) {
 			dev_err(dev, "no offset in %s\n", key);
-			return -EINVAL;
+			goto put_node;
 		}
 
 		ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit);
 		if (ret < 0) {
 			dev_err(dev, "no bit in %s\n", key);
-			return -EINVAL;
+			goto put_node;
 		}
 	}
 
@@ -1385,7 +1390,8 @@ static int qcom_smd_parse_edge(struct device *dev,
 	irq = irq_of_parse_and_map(node, 0);
 	if (irq < 0) {
 		dev_err(dev, "required smd interrupt missing\n");
-		return -EINVAL;
+		ret = irq;
+		goto put_node;
 	}
 
 	ret = devm_request_irq(dev, irq,
@@ -1393,12 +1399,18 @@ static int qcom_smd_parse_edge(struct device *dev,
 			       node->name, edge);
 	if (ret) {
 		dev_err(dev, "failed to request smd irq\n");
-		return ret;
+		goto put_node;
 	}
 
 	edge->irq = irq;
 
 	return 0;
+
+put_node:
+	of_node_put(node);
+	edge->of_node = NULL;
+
+	return ret;
 }
 
 /*
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index a6361cad608b..91de940896e3 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -81,7 +81,7 @@ EXPORT_SYMBOL(rpmsg_create_ept);
  */
 void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 {
-	if (ept)
+	if (ept && ept->ops)
 		ept->ops->destroy_ept(ept);
 }
 EXPORT_SYMBOL(rpmsg_destroy_ept);
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 9006fc7f73d0..7d7ed4e5cce7 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -123,7 +123,12 @@ enum rpmsg_ns_flags {
 };
 
 /**
- * @vrp: the remote processor this channel belongs to
+ * struct virtio_rpmsg_channel - rpmsg channel descriptor
+ * @rpdev: the rpmsg channel device
+ * @vrp: the virtio remote processor device this channel belongs to
+ *
+ * This structure stores the channel that links the rpmsg device to the virtio
+ * remote processor device.
  */
 struct virtio_rpmsg_channel {
 	struct rpmsg_device rpdev;