linux-kernel - [PATCH 4/4] bsg: make bsg_class a static const structure

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Date:   Tue, 20 Jun 2023 20:01:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Ivan Orlov <ivan.orlov0322@...il.com>,
        FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
        Jens Axboe <axboe@...nel.dk>, linux-scsi@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4/4] bsg: make bsg_class a static const structure

From: Ivan Orlov <ivan.orlov0322@...il.com>

Now that the driver core allows for struct class to be in read-only
memory, move the bsg_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: linux-scsi@...r.kernel.org
Cc: linux-block@...r.kernel.org
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/bsg.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index 7eca43f33d7f..e04fb075d604 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -39,7 +39,7 @@ static inline struct bsg_device *to_bsg_device(struct inode *inode)
 #define BSG_MAX_DEVS		32768
 
 static DEFINE_IDA(bsg_minor_ida);
-static struct class *bsg_class;
+static const struct class bsg_class;
 static int bsg_major;
 
 static unsigned int bsg_timeout(struct bsg_device *bd, struct sg_io_v4 *hdr)
@@ -206,7 +206,7 @@ struct bsg_device *bsg_register_queue(struct request_queue *q,
 		return ERR_PTR(ret);
 	}
 	bd->device.devt = MKDEV(bsg_major, ret);
-	bd->device.class = bsg_class;
+	bd->device.class = &bsg_class;
 	bd->device.parent = parent;
 	bd->device.release = bsg_device_release;
 	dev_set_name(&bd->device, "%s", name);
@@ -240,15 +240,19 @@ static char *bsg_devnode(const struct device *dev, umode_t *mode)
 	return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev));
 }
 
+static const struct class bsg_class = {
+	.name		= "bsg",
+	.devnode	= bsg_devnode,
+};
+
 static int __init bsg_init(void)
 {
 	dev_t devid;
 	int ret;
 
-	bsg_class = class_create("bsg");
-	if (IS_ERR(bsg_class))
-		return PTR_ERR(bsg_class);
-	bsg_class->devnode = bsg_devnode;
+	ret = class_register(&bsg_class);
+	if (ret)
+		return ret;
 
 	ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg");
 	if (ret)
@@ -260,7 +264,7 @@ static int __init bsg_init(void)
 	return 0;
 
 destroy_bsg_class:
-	class_destroy(bsg_class);
+	class_unregister(&bsg_class);
 	return ret;
 }
 
-- 
2.41.0