linux-kernel - [PATCH v7 02/12] rpmsg: Create the rpmsg class in core instead of in rpmsg char

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Date:   Mon, 8 Nov 2021 15:19:27 +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>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <julien.massot@....bzh>, <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v7 02/12] rpmsg: Create the rpmsg class in core instead of in rpmsg char

Migrate the creation of the rpmsg class from the rpmsg_char
to the core that the class is usable by the rpmsg_char and
the futur rpmsg_ctrl module.

Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
Update vs previous revision:
- remove rpmsg_get_class API and export the rpmsg_class in rpmsg_internal.h
---
 drivers/rpmsg/rpmsg_char.c     | 10 ----------
 drivers/rpmsg/rpmsg_core.c     | 15 +++++++++++++--
 drivers/rpmsg/rpmsg_internal.h |  2 ++
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 44934d7fa3c4..8ab5ac23850c 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -29,7 +29,6 @@
 #define RPMSG_DEV_MAX	(MINORMASK + 1)
 
 static dev_t rpmsg_major;
-static struct class *rpmsg_class;
 
 static DEFINE_IDA(rpmsg_ctrl_ida);
 static DEFINE_IDA(rpmsg_ept_ida);
@@ -559,17 +558,9 @@ static int rpmsg_chrdev_init(void)
 		return ret;
 	}
 
-	rpmsg_class = class_create(THIS_MODULE, "rpmsg");
-	if (IS_ERR(rpmsg_class)) {
-		pr_err("failed to create rpmsg class\n");
-		unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
-		return PTR_ERR(rpmsg_class);
-	}
-
 	ret = register_rpmsg_driver(&rpmsg_chrdev_driver);
 	if (ret < 0) {
 		pr_err("rpmsgchr: failed to register rpmsg driver\n");
-		class_destroy(rpmsg_class);
 		unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
 	}
 
@@ -580,7 +571,6 @@ postcore_initcall(rpmsg_chrdev_init);
 static void rpmsg_chrdev_exit(void)
 {
 	unregister_rpmsg_driver(&rpmsg_chrdev_driver);
-	class_destroy(rpmsg_class);
 	unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
 }
 module_exit(rpmsg_chrdev_exit);
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index 9151836190ce..45227c864aa2 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -20,6 +20,9 @@
 
 #include "rpmsg_internal.h"
 
+struct class *rpmsg_class;
+EXPORT_SYMBOL(rpmsg_class);
+
 /**
  * rpmsg_create_channel() - create a new rpmsg channel
  * using its name and address info.
@@ -629,10 +632,17 @@ static int __init rpmsg_init(void)
 {
 	int ret;
 
+	rpmsg_class = class_create(THIS_MODULE, "rpmsg");
+	if (IS_ERR(rpmsg_class)) {
+		pr_err("failed to create rpmsg class\n");
+		return PTR_ERR(rpmsg_class);
+	}
+
 	ret = bus_register(&rpmsg_bus);
-	if (ret)
+	if (ret) {
 		pr_err("failed to register rpmsg bus: %d\n", ret);
-
+		class_destroy(rpmsg_class);
+	}
 	return ret;
 }
 postcore_initcall(rpmsg_init);
@@ -640,6 +650,7 @@ postcore_initcall(rpmsg_init);
 static void __exit rpmsg_fini(void)
 {
 	bus_unregister(&rpmsg_bus);
+	class_destroy(rpmsg_class);
 }
 module_exit(rpmsg_fini);
 
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index a76c344253bf..1b6f998e1a4a 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h
@@ -18,6 +18,8 @@
 #define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
 #define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
 
+extern struct class *rpmsg_class;
+
 /**
  * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
  * @create_channel:	create backend-specific channel, optional
-- 
2.17.1