From 244b2c5ca8b14627e4a17755e5922221e121c771 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 09 Oct 2024 06:15:07 +0000
Subject: [PATCH] change system file

---
 kernel/drivers/rpmsg/rpmsg_core.c |   78 +++++++++++++++++++++++++++++++++++---
 1 files changed, 71 insertions(+), 7 deletions(-)

diff --git a/kernel/drivers/rpmsg/rpmsg_core.c b/kernel/drivers/rpmsg/rpmsg_core.c
index 6583415..dc9e9d2 100644
--- a/kernel/drivers/rpmsg/rpmsg_core.c
+++ b/kernel/drivers/rpmsg/rpmsg_core.c
@@ -46,7 +46,7 @@
  * equals to the src address of their rpmsg channel), the driver's handler
  * is invoked to process it.
  *
- * That said, more complicated drivers might do need to allocate
+ * That said, more complicated drivers might need to allocate
  * additional rpmsg addresses, and bind them to different rx callbacks.
  * To accomplish that, those drivers need to call this function.
  *
@@ -81,7 +81,7 @@
  */
 void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 {
-	if (ept)
+	if (ept && ept->ops)
 		ept->ops->destroy_ept(ept);
 }
 EXPORT_SYMBOL(rpmsg_destroy_ept);
@@ -177,7 +177,7 @@
 EXPORT_SYMBOL(rpmsg_send_offchannel);
 
 /**
- * rpmsg_send() - send a message across to the remote processor
+ * rpmsg_trysend() - send a message across to the remote processor
  * @ept: the rpmsg endpoint
  * @data: payload of message
  * @len: length of payload
@@ -205,7 +205,7 @@
 EXPORT_SYMBOL(rpmsg_trysend);
 
 /**
- * rpmsg_sendto() - send a message across to the remote processor, specify dst
+ * rpmsg_trysendto() - send a message across to the remote processor, specify dst
  * @ept: the rpmsg endpoint
  * @data: payload of message
  * @len: length of payload
@@ -253,7 +253,7 @@
 EXPORT_SYMBOL(rpmsg_poll);
 
 /**
- * rpmsg_send_offchannel() - send a message using explicit src/dst addresses
+ * rpmsg_trysend_offchannel() - send a message using explicit src/dst addresses
  * @ept: the rpmsg endpoint
  * @src: source address
  * @dst: destination address
@@ -283,8 +283,67 @@
 }
 EXPORT_SYMBOL(rpmsg_trysend_offchannel);
 
+/**
+ * rpmsg_get_signals() - get the signals for this endpoint
+ * @ept:	the rpmsg endpoint
+ *
+ * Returns signal bits on success and an appropriate error value on failure.
+ */
+int rpmsg_get_signals(struct rpmsg_endpoint *ept)
+{
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->get_signals)
+		return -ENXIO;
+
+	return ept->ops->get_signals(ept);
+}
+EXPORT_SYMBOL(rpmsg_get_signals);
+
+/**
+ * rpmsg_set_signals() - set the remote signals for this endpoint
+ * @ept:	the rpmsg endpoint
+ * @set:	set mask for signals
+ * @clear:	clear mask for signals
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+int rpmsg_set_signals(struct rpmsg_endpoint *ept, u32 set, u32 clear)
+{
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->set_signals)
+		return -ENXIO;
+
+	return ept->ops->set_signals(ept, set, clear);
+}
+EXPORT_SYMBOL(rpmsg_set_signals);
+
+#ifdef CONFIG_NO_GKI
+/**
+ * rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
+ * @ept: the rpmsg endpoint
+ *
+ * This function returns maximum buffer size available for a single outgoing message.
+ *
+ * Return: the maximum transmission size on success and an appropriate error
+ * value on failure.
+ */
+
+ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
+{
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->get_mtu)
+		return -ENOTSUPP;
+
+	return ept->ops->get_mtu(ept);
+}
+EXPORT_SYMBOL(rpmsg_get_mtu);
+#endif
+
 /*
- * match an rpmsg channel with a channel info struct.
+ * match a rpmsg channel with a channel info struct.
  * this is used to make sure we're not creating rpmsg devices for channels
  * that already exist.
  */
@@ -468,6 +527,10 @@
 
 		rpdev->ept = ept;
 		rpdev->src = ept->addr;
+
+		if (rpdrv->signals)
+			ept->sig_cb = rpdrv->signals;
+
 	}
 
 	err = rpdrv->probe(rpdev);
@@ -505,7 +568,8 @@
 	if (rpdev->ops->announce_destroy)
 		err = rpdev->ops->announce_destroy(rpdev);
 
-	rpdrv->remove(rpdev);
+	if (rpdrv->remove)
+		rpdrv->remove(rpdev);
 
 	dev_pm_domain_detach(dev, true);
 

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