linux-kernel - [RFC PATCH 02/13] switchtec: export class symbol for use in upper layer driver

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Date:   Thu, 15 Jun 2017 14:37:18 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-ntb@...glegroups.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <Allen.Hubbe@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [RFC PATCH 02/13] switchtec: export class symbol for use in upper layer driver

We switch to class_register/unregister and a declared class which
is exported for use in the switchtec_ntb driver.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Stephen Bates <sbates@...thlin.com>
Reviewed-by: Kurt Schwemmer <kurt.schwemmer@...rosemi.com>
---
 drivers/pci/switch/switchtec.c | 21 +++++++++++----------
 include/linux/switchtec.h      |  2 ++
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index c4369ba7bbc1..e9bf17b1934e 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -21,8 +21,6 @@
 #include <linux/fs.h>
 #include <linux/uaccess.h>
 #include <linux/poll.h>
-#include <linux/pci.h>
-#include <linux/cdev.h>
 #include <linux/wait.h>
 
 MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver");
@@ -35,9 +33,14 @@ module_param(max_devices, int, 0644);
 MODULE_PARM_DESC(max_devices, "max number of switchtec device instances");
 
 static dev_t switchtec_devt;
-static struct class *switchtec_class;
 static DEFINE_IDA(switchtec_minor_ida);
 
+struct class switchtec_class = {
+	.owner = THIS_MODULE,
+	.name = "switchtec",
+};
+EXPORT_SYMBOL(switchtec_class);
+
 enum mrpc_state {
 	MRPC_IDLE = 0,
 	MRPC_QUEUED,
@@ -1026,7 +1029,7 @@ static struct switchtec_dev *stdev_create(struct pci_dev *pdev)
 
 	dev = &stdev->dev;
 	device_initialize(dev);
-	dev->class = switchtec_class;
+	dev->class = &switchtec_class;
 	dev->parent = &pdev->dev;
 	dev->groups = switchtec_device_groups;
 	dev->release = stdev_release;
@@ -1313,11 +1316,9 @@ static int __init switchtec_init(void)
 	if (rc)
 		return rc;
 
-	switchtec_class = class_create(THIS_MODULE, "switchtec");
-	if (IS_ERR(switchtec_class)) {
-		rc = PTR_ERR(switchtec_class);
+	rc = class_register(&switchtec_class);
+	if (rc)
 		goto err_create_class;
-	}
 
 	rc = pci_register_driver(&switchtec_pci_driver);
 	if (rc)
@@ -1328,7 +1329,7 @@ static int __init switchtec_init(void)
 	return 0;
 
 err_pci_register:
-	class_destroy(switchtec_class);
+	class_unregister(&switchtec_class);
 
 err_create_class:
 	unregister_chrdev_region(switchtec_devt, max_devices);
@@ -1340,7 +1341,7 @@ module_init(switchtec_init);
 static void __exit switchtec_exit(void)
 {
 	pci_unregister_driver(&switchtec_pci_driver);
-	class_destroy(switchtec_class);
+	class_unregister(&switchtec_class);
 	unregister_chrdev_region(switchtec_devt, max_devices);
 	ida_destroy(&switchtec_minor_ida);
 
diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
index 508cda78a430..3b87618fc42f 100644
--- a/include/linux/switchtec.h
+++ b/include/linux/switchtec.h
@@ -267,4 +267,6 @@ static inline struct switchtec_dev *to_stdev(struct device *dev)
 	return container_of(dev, struct switchtec_dev, dev);
 }
 
+extern struct class switchtec_class;
+
 #endif
-- 
2.11.0