Merge tag 'rpmsg-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/…

…git/remoteproc/linux

Pull rpmsg updates from Bjorn Andersson:
 "This contains fixes and cleanups in the rpmsg core, Qualcomm SMD and
  GLINK drivers, a circular lock dependency in the Mediatek driver and
  a possible race condition in the rpmsg_char driver is resolved"

* tag 'rpmsg-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux:
  rpmsg: convert sysfs snprintf to sysfs_emit
  rpmsg: qcom_smd: Fix refcount leak in qcom_smd_parse_edge
  rpmsg: qcom: correct kerneldoc
  rpmsg: qcom: glink: remove unused name
  rpmsg: qcom: glink: replace strncpy() with strscpy_pad()
  rpmsg: Strcpy is not safe, use strscpy_pad() instead
  rpmsg: Fix possible refcount leak in rpmsg_register_device_override()
  rpmsg: Fix parameter naming for announce_create/destroy ops
  rpmsg: mtk_rpmsg: Fix circular locking dependency
  rpmsg: char: Add mutex protection for rpmsg_eptdev_open()

drivers/rpmsg/mtk_rpmsg.c

@@ -234,7 +234,9 @@ static void mtk_register_device_work_function(struct work_struct *register_work)
 		if (info->registered)
 			continue;
 
+		mutex_unlock(&subdev->channels_lock);
 		ret = mtk_rpmsg_register_device(subdev, &info->info);
+		mutex_lock(&subdev->channels_lock);
 		if (ret) {
 			dev_err(&pdev->dev, "Can't create rpmsg_device\n");
 			continue;

drivers/rpmsg/qcom_glink_native.c

@@ -98,8 +98,6 @@ struct glink_core_rx_intent {
 struct qcom_glink {
 	struct device *dev;
 
-	const char *name;
-
 	struct mbox_client mbox_client;
 	struct mbox_chan *mbox_chan;
 
@@ -1546,7 +1544,7 @@ static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
 	cancel_work_sync(&channel->intent_work);
 
 	if (channel->rpdev) {
-		strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
+		strscpy_pad(chinfo.name, channel->name, sizeof(chinfo.name));
 		chinfo.src = RPMSG_ADDR_ANY;
 		chinfo.dst = RPMSG_ADDR_ANY;
 
@@ -1674,7 +1672,7 @@ static ssize_t rpmsg_name_show(struct device *dev,
 	if (ret < 0)
 		name = dev->of_node->name;
 
-	return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name);
+	return sysfs_emit(buf, "%s\n", name);
 }
 static DEVICE_ATTR_RO(rpmsg_name);
 
@@ -1755,10 +1753,6 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 	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;
-
 	glink->mbox_client.dev = dev;
 	glink->mbox_client.knows_txdone = true;
 	glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);

drivers/rpmsg/qcom_glink_ssr.c

@@ -39,7 +39,7 @@ struct cleanup_done_msg {
 	__le32 seq_num;
 };
 
-/**
+/*
  * G-Link SSR protocol commands
  */
 #define GLINK_SSR_DO_CLEANUP	0

drivers/rpmsg/qcom_smd.c

@@ -729,11 +729,11 @@ static int qcom_smd_write_fifo(struct qcom_smd_channel *channel,
 }
 
 /**
- * qcom_smd_send - write data to smd channel
+ * __qcom_smd_send - write data to smd channel
  * @channel:	channel handle
  * @data:	buffer of data to write
  * @len:	number of bytes to write
- * @wait:	flag to indicate if write has ca wait
+ * @wait:	flag to indicate if write can wait
  *
  * This is a blocking write of len bytes into the channel's tx ring buffer and
  * signal the remote end. It will sleep until there is enough space available
@@ -1089,7 +1089,7 @@ static int qcom_smd_create_device(struct qcom_smd_channel *channel)
 
 	/* Assign public information to the rpmsg_device */
 	rpdev = &qsdev->rpdev;
-	strncpy(rpdev->id.name, channel->name, RPMSG_NAME_SIZE);
+	strscpy_pad(rpdev->id.name, channel->name, RPMSG_NAME_SIZE);
 	rpdev->src = RPMSG_ADDR_ANY;
 	rpdev->dst = RPMSG_ADDR_ANY;
 
@@ -1323,7 +1323,7 @@ static void qcom_channel_state_worker(struct work_struct *work)
 
 		spin_unlock_irqrestore(&edge->channels_lock, flags);
 
-		strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
+		strscpy_pad(chinfo.name, channel->name, sizeof(chinfo.name));
 		chinfo.src = RPMSG_ADDR_ANY;
 		chinfo.dst = RPMSG_ADDR_ANY;
 		rpmsg_unregister_device(&edge->dev, &chinfo);
@@ -1383,6 +1383,7 @@ static int qcom_smd_parse_edge(struct device *dev,
 		}
 
 		edge->ipc_regmap = syscon_node_to_regmap(syscon_np);
+		of_node_put(syscon_np);
 		if (IS_ERR(edge->ipc_regmap)) {
 			ret = PTR_ERR(edge->ipc_regmap);
 			goto put_node;

drivers/rpmsg/rpmsg_char.c

@@ -120,8 +120,11 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
 	struct rpmsg_device *rpdev = eptdev->rpdev;
 	struct device *dev = &eptdev->dev;
 
-	if (eptdev->ept)
+	mutex_lock(&eptdev->ept_lock);
+	if (eptdev->ept) {
+		mutex_unlock(&eptdev->ept_lock);
 		return -EBUSY;
+	}
 
 	get_device(dev);
 
@@ -137,11 +140,13 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
 	if (!ept) {
 		dev_err(dev, "failed to open %s\n", eptdev->chinfo.name);
 		put_device(dev);
+		mutex_unlock(&eptdev->ept_lock);
 		return -EINVAL;
 	}
 
 	eptdev->ept = ept;
 	filp->private_data = eptdev;
+	mutex_unlock(&eptdev->ept_lock);
 
 	return 0;
 }

drivers/rpmsg/rpmsg_core.c

@@ -604,7 +604,7 @@ int rpmsg_register_device_override(struct rpmsg_device *rpdev,
 	int ret;
 
 	if (driver_override)
-		strcpy(rpdev->id.name, driver_override);
+		strscpy_pad(rpdev->id.name, driver_override, RPMSG_NAME_SIZE);
 
 	dev_set_name(dev, "%s.%s.%d.%d", dev_name(dev->parent),
 		     rpdev->id.name, rpdev->src, rpdev->dst);
@@ -618,6 +618,7 @@ int rpmsg_register_device_override(struct rpmsg_device *rpdev,
 					  strlen(driver_override));
 		if (ret) {
 			dev_err(dev, "device_set_override failed: %d\n", ret);
+			put_device(dev);
 			return ret;
 		}
 	}

drivers/rpmsg/rpmsg_internal.h

@@ -41,8 +41,8 @@ struct rpmsg_device_ops {
 					    rpmsg_rx_cb_t cb, void *priv,
 					    struct rpmsg_channel_info chinfo);
 
-	int (*announce_create)(struct rpmsg_device *ept);
-	int (*announce_destroy)(struct rpmsg_device *ept);
+	int (*announce_create)(struct rpmsg_device *rpdev);
+	int (*announce_destroy)(struct rpmsg_device *rpdev);
 };
 
 /**