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bsg: make bsg_class a static const structure

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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@lab.ntt.co.jp>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-scsi@vger.kernel.org
Cc: linux-block@vger.kernel.org
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20230620180129.645646-8-gregkh@linuxfoundation.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ivan Orlov 2023-06-20 20:01:33 +02:00 • committed by Jens Axboe
parent 2eefd399d2
commit 72ef02b8df
1 changed files with 11 additions and 7 deletions
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18
block/bsg.c
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@ -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)
@ -208,7 +208,7 @@ 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);
@ -242,15 +242,19 @@ 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)
@ -262,7 +266,7 @@ static int __init bsg_init(void)
return 0;
destroy_bsg_class:
class_destroy(bsg_class);
class_unregister(&bsg_class);
return ret;
}