linux-kernel - [PATCH 4.9 115/130] rpmsg: virtio_rpmsg

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Date:   Tue, 24 Jan 2017 08:55:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Griffin <peter.griffin@...aro.org>,
        Loic Pallardy <loic.pallardy@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH 4.9 115/130] rpmsg: virtio_rpmsg_bus: fix channel creation

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Loic Pallardy <loic.pallardy@...com>

commit 63447646ac657fde00bb658ce21a3431940ae0ad upstream.

Since commit 4dffed5b3ac796b ("rpmsg: Name rpmsg devices based on
channel id"), it is no more possible for a firmware to register twice
a service (on different endpoints). rpmsg_register_device function
is failing when calling device_add for the second time as second
device has the same name as first one already register.
It is because name is based only on service name and so is not more
unique. Previously name was unique thanks to the use of rpmsg_dev_index.

This patch adds destination and source endpoint numbers device name to
create an unique identifier.

Fixes: 4dffed5b3ac7 ("rpmsg: Name rpmsg devices based on channel id")
Acked-by: Peter Griffin <peter.griffin@...aro.org>
Signed-off-by: Loic Pallardy <loic.pallardy@...com>
[bjorn: flipped name and address in device name]
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/rpmsg/rpmsg_core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -411,8 +411,8 @@ int rpmsg_register_device(struct rpmsg_d
 	struct device *dev = &rpdev->dev;
 	int ret;

-	dev_set_name(&rpdev->dev, "%s:%s",
-		     dev_name(dev->parent), rpdev->id.name);
+	dev_set_name(&rpdev->dev, "%s.%s.%d.%d", dev_name(dev->parent),
+		     rpdev->id.name, rpdev->src, rpdev->dst);

 	rpdev->dev.bus = &rpmsg_bus;
 	rpdev->dev.release = rpmsg_release_device;