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[SCSI] bsg: make class backlinks

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Currently, bsg doesn't make class backlinks (a process whereby you'd get
a link to bsg in the device directory in the same way you get one for
sg).  This is because the bsg device is uninitialised, so the class
device has nothing it can attach to.  The fix is to make the bsg device
point to the cdevice of the entity creating the bsg, necessitating
changing the bsg_register_queue() prototype into a form that takes the
generic device.

Acked-by: FUJITA Tomonori <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
James Bottomley 2007-07-20 18:22:17 -05:00 • committed by James Bottomley
commit 39dca558a5
4 changed files with 38 additions and 21 deletions
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21
block/bsg.c
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@ -936,20 +936,29 @@ void bsg_unregister_queue(struct request_queue *q)
mutex_lock(&bsg_mutex);
sysfs_remove_link(&q->kobj, "bsg");
class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor));
class_device_unregister(bcd->class_dev);
put_device(bcd->dev);
bcd->class_dev = NULL;
bcd->dev = NULL;
list_del_init(&bcd->list);
bsg_device_nr--;
mutex_unlock(&bsg_mutex);
}
EXPORT_SYMBOL_GPL(bsg_unregister_queue);
int bsg_register_queue(struct request_queue *q, const char *name)
int bsg_register_queue(struct request_queue *q, struct device *gdev,
const char *name)
{
struct bsg_class_device *bcd, *__bcd;
dev_t dev;
int ret = -EMFILE;
struct class_device *class_dev = NULL;
const char *devname;
if (name)
devname = name;
else
devname = gdev->bus_id;
/*
* we need a proper transport to send commands, not a stacked device
@ -982,11 +991,13 @@ retry:
bsg_minor_idx = 0;
bcd->queue = q;
bcd->dev = get_device(gdev);
dev = MKDEV(bsg_major, bcd->minor);
class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
class_dev = class_device_create(bsg_class, NULL, dev, gdev, "%s",
devname);
if (IS_ERR(class_dev)) {
ret = PTR_ERR(class_dev);
goto err;
goto err_put;
}
bcd->class_dev = class_dev;
@ -1004,6 +1015,8 @@ retry:
err_unregister:
class_device_unregister(class_dev);
err_put:
put_device(gdev);
err:
mutex_unlock(&bsg_mutex);
return ret;