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

[Logan Gunthorpe]

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 <log...@deltatee.com>
Reviewed-by: Stephen Bates <sba...@raithlin.com>
Reviewed-by: Kurt Schwemmer <kurt.schwem...@microsemi.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