linux-kernel - [PATCH v2 11/16] rpmsg: char: check destination address is not null

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Date:   Tue, 22 Dec 2020 11:57:21 +0100
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Andy Gross <agross@...nel.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-msm@...r.kernel.org>, <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v2 11/16] rpmsg: char: check destination address is not null

The name service announcement is not sent if no endpoint is created by
default. If the destination address is not precised by the
application when creating the device (thanks to the RPMsg CTRL interface),
it is not possible to have a valid RPMsg channel.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/rpmsg/rpmsg_char.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 4b0674a2e3e9..8b1928594d10 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -305,6 +305,16 @@ static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
 	struct device *dev;
 	int ret;
 
+	/* There is not ept created by default. As consequence there is not NS
+	 * announcement and the destination address has to be set.
+	 * this limitation could be solved in future by adding a helper in
+	 * rpmsg_ns.
+	 */
+	if (rpdev->dst == RPMSG_ADDR_ANY) {
+		dev_err(dev, "destination address invalid (%d)\n", rpdev->dst);
+		return -EINVAL;
+	}
+
 	eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL);
 	if (!eptdev)
 		return -ENOMEM;
-- 
2.17.1