linux-kernel - [RFC PATCH 16/22] samples/rpmsg: Wait for address to be bound to rpdev for sending message

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Date:   Thu, 2 Jul 2020 13:51:37 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-ntb@...glegroups.com>,
        <linux-pci@...r.kernel.org>, <kvm@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>
Subject: [RFC PATCH 16/22] samples/rpmsg: Wait for address to be bound to rpdev for sending message

rpmsg_client_sample can use either virtio_rpmsg_bus or vhost_rpmsg_bus
to send messages. In the case of vhost_rpmsg_bus, the destination
address of rpdev will be assigned only after receiving address service
notification from the remote virtio_rpmsg_bus. Wait for address to be
bound to rpdev (rpmsg_client_sample running in vhost system) before
sending messages to the remote virtio_rpmsg_bus.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 samples/rpmsg/rpmsg_client_sample.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/samples/rpmsg/rpmsg_client_sample.c b/samples/rpmsg/rpmsg_client_sample.c
index 514a51945d69..07149d7fbd0c 100644
--- a/samples/rpmsg/rpmsg_client_sample.c
+++ b/samples/rpmsg/rpmsg_client_sample.c
@@ -57,10 +57,14 @@ static void rpmsg_sample_send_msg_work(struct work_struct *work)
 	struct rpmsg_device *rpdev = idata->rpdev;
 	int ret;
 
-	/* send a message to our remote processor */
-	ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
-	if (ret)
-		dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
+	if (rpdev->dst != RPMSG_ADDR_ANY) {
+		/* send a message to our remote processor */
+		ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
+		if (ret)
+			dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
+	} else {
+		schedule_delayed_work(&idata->send_msg_work, msecs_to_jiffies(50));
+	}
 }
 
 static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
-- 
2.17.1