linux-kernel - [PATCH 4/7] rpmsg: char: Introduce __rpmsg_chrdev_create

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Date:   Tue, 23 Mar 2021 13:27:34 +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 4/7] rpmsg: char: Introduce __rpmsg_chrdev_create_eptdev function

Introduce the __rpmsg_chrdev_create_eptdev internal function that returns
the rpmsg_eptdev context structure.

This patch prepares the introduction of a rpmsg channel device for the
char device. The rpmsg device will need a reference to the context.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>

---
update from [1]
- propagate parent param in rpmsg_chrdev_create_eptdev,
- fix changelog.

[1] https://patchwork.kernel.org/project/linux-remoteproc/patch/20210219111501.14261-14-arnaud.pouliquen@foss.st.com/
---
 drivers/rpmsg/rpmsg_char.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 5d4a768002ce..7f6d46078179 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -325,7 +325,8 @@ static void rpmsg_eptdev_release_device(struct device *dev)
 	kfree(eptdev);
 }
 
-int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent,
+static struct rpmsg_eptdev *__rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev,
+							 struct device *parent,
 			       struct rpmsg_channel_info chinfo, struct class *rpmsg_class)
 {
 	struct rpmsg_eptdev *eptdev;
@@ -334,7 +335,7 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent
 
 	eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL);
 	if (!eptdev)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	dev = &eptdev->dev;
 	eptdev->rpdev = rpdev;
@@ -378,7 +379,7 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent
 		put_device(dev);
 	}
 
-	return ret;
+	return eptdev;
 
 free_ept_ida:
 	ida_simple_remove(&rpmsg_ept_ida, dev->id);
@@ -388,7 +389,19 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent
 	put_device(dev);
 	kfree(eptdev);
 
-	return ret;
+	return ERR_PTR(ret);
+}
+
+int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent,
+			       struct rpmsg_channel_info chinfo,  struct class *rpmsg_class)
+{
+	struct rpmsg_eptdev *eptdev;
+
+	eptdev = __rpmsg_chrdev_create_eptdev(rpdev, parent, chinfo, rpmsg_class);
+	if (IS_ERR(eptdev))
+		return PTR_ERR(eptdev);
+
+	return 0;
 }
 EXPORT_SYMBOL(rpmsg_chrdev_create_eptdev);
 
-- 
2.17.1