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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/rpmsg/rpmsg_core.c
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@@ -46,7 +46,7 @@
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  * equals to the src address of their rpmsg channel), the driver's handler
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  * is invoked to process it.
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  *
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- * That said, more complicated drivers might do need to allocate
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+ * That said, more complicated drivers might need to allocate
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  * additional rpmsg addresses, and bind them to different rx callbacks.
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  * To accomplish that, those drivers need to call this function.
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  *
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@@ -81,7 +81,7 @@
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  */
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 void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
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 {
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-	if (ept)
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+	if (ept && ept->ops)
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 		ept->ops->destroy_ept(ept);
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 }
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 EXPORT_SYMBOL(rpmsg_destroy_ept);
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@@ -177,7 +177,7 @@
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 EXPORT_SYMBOL(rpmsg_send_offchannel);
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 /**
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- * rpmsg_send() - send a message across to the remote processor
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+ * rpmsg_trysend() - send a message across to the remote processor
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  * @ept: the rpmsg endpoint
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  * @data: payload of message
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  * @len: length of payload
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@@ -205,7 +205,7 @@
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 EXPORT_SYMBOL(rpmsg_trysend);
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 /**
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- * rpmsg_sendto() - send a message across to the remote processor, specify dst
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+ * rpmsg_trysendto() - send a message across to the remote processor, specify dst
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  * @ept: the rpmsg endpoint
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  * @data: payload of message
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  * @len: length of payload
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@@ -253,7 +253,7 @@
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 EXPORT_SYMBOL(rpmsg_poll);
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 /**
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- * rpmsg_send_offchannel() - send a message using explicit src/dst addresses
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+ * rpmsg_trysend_offchannel() - send a message using explicit src/dst addresses
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  * @ept: the rpmsg endpoint
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  * @src: source address
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  * @dst: destination address
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@@ -283,8 +283,67 @@
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 }
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 EXPORT_SYMBOL(rpmsg_trysend_offchannel);
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+/**
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+ * rpmsg_get_signals() - get the signals for this endpoint
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+ * @ept:	the rpmsg endpoint
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+ *
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+ * Returns signal bits on success and an appropriate error value on failure.
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+ */
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+int rpmsg_get_signals(struct rpmsg_endpoint *ept)
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+{
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+	if (WARN_ON(!ept))
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+		return -EINVAL;
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+	if (!ept->ops->get_signals)
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+		return -ENXIO;
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+
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+	return ept->ops->get_signals(ept);
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+}
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+EXPORT_SYMBOL(rpmsg_get_signals);
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+
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+/**
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+ * rpmsg_set_signals() - set the remote signals for this endpoint
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+ * @ept:	the rpmsg endpoint
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+ * @set:	set mask for signals
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+ * @clear:	clear mask for signals
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+ *
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+ * Returns 0 on success and an appropriate error value on failure.
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+ */
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+int rpmsg_set_signals(struct rpmsg_endpoint *ept, u32 set, u32 clear)
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+{
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+	if (WARN_ON(!ept))
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+		return -EINVAL;
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+	if (!ept->ops->set_signals)
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+		return -ENXIO;
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+
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+	return ept->ops->set_signals(ept, set, clear);
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+}
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+EXPORT_SYMBOL(rpmsg_set_signals);
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+
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+#ifdef CONFIG_NO_GKI
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+/**
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+ * rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
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+ * @ept: the rpmsg endpoint
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+ *
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+ * This function returns maximum buffer size available for a single outgoing message.
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+ *
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+ * Return: the maximum transmission size on success and an appropriate error
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+ * value on failure.
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+ */
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+
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+ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
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+{
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+	if (WARN_ON(!ept))
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+		return -EINVAL;
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+	if (!ept->ops->get_mtu)
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+		return -ENOTSUPP;
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+
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+	return ept->ops->get_mtu(ept);
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+}
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+EXPORT_SYMBOL(rpmsg_get_mtu);
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+#endif
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+
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 /*
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- * match an rpmsg channel with a channel info struct.
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+ * match a rpmsg channel with a channel info struct.
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  * this is used to make sure we're not creating rpmsg devices for channels
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  * that already exist.
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  */
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@@ -468,6 +527,10 @@
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 		rpdev->ept = ept;
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 		rpdev->src = ept->addr;
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+
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+		if (rpdrv->signals)
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+			ept->sig_cb = rpdrv->signals;
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+
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 	}
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 	err = rpdrv->probe(rpdev);
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@@ -505,7 +568,8 @@
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 	if (rpdev->ops->announce_destroy)
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 		err = rpdev->ops->announce_destroy(rpdev);
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-	rpdrv->remove(rpdev);
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+	if (rpdrv->remove)
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+		rpdrv->remove(rpdev);
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 	dev_pm_domain_detach(dev, true);
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