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

[Kishon Vijay Abraham I]

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 <kis...@ti.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