netdev - [RFC PATCH 15/22] samples/rpmsg: Setup delayed work to send message

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Date:   Thu, 2 Jul 2020 13:51:36 +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 15/22] samples/rpmsg: Setup delayed work to send message

Let us not send any message to the remote processor before
announce_create() callback has been invoked. Since announce_create() is
only invoked after ->probe() is completed, setup delayed work to start
sending message to the remote processor.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 samples/rpmsg/rpmsg_client_sample.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/samples/rpmsg/rpmsg_client_sample.c b/samples/rpmsg/rpmsg_client_sample.c
index ae5081662283..514a51945d69 100644
--- a/samples/rpmsg/rpmsg_client_sample.c
+++ b/samples/rpmsg/rpmsg_client_sample.c
@@ -20,6 +20,8 @@ module_param(count, int, 0644);
 
 struct instance_data {
 	int rx_count;
+	struct delayed_work send_msg_work;
+	struct rpmsg_device *rpdev;
 };
 
 static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
@@ -48,9 +50,21 @@ static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
 	return 0;
 }
 
-static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
+static void rpmsg_sample_send_msg_work(struct work_struct *work)
 {
+	struct instance_data *idata = container_of(work, struct instance_data,
+						   send_msg_work.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);
+}
+
+static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
+{
 	struct instance_data *idata;
 
 	dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
@@ -62,18 +76,18 @@ static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
 
 	dev_set_drvdata(&rpdev->dev, idata);
 
-	/* 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);
-		return ret;
-	}
+	idata->rpdev = rpdev;
+	INIT_DELAYED_WORK(&idata->send_msg_work, rpmsg_sample_send_msg_work);
+	schedule_delayed_work(&idata->send_msg_work, msecs_to_jiffies(500));
 
 	return 0;
 }
 
 static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
 {
+	struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
+
+	cancel_delayed_work_sync(&idata->send_msg_work);
 	dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
 }
 
-- 
2.17.1