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-rw-r--r--block/bsg.c43
1 files changed, 29 insertions, 14 deletions
diff --git a/block/bsg.c b/block/bsg.c
index f51172ed27c2..23ea4fd1a66d 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -699,14 +699,26 @@ static struct bsg_device *bsg_alloc_device(void)
return bd;
}
+static void bsg_kref_release_function(struct kref *kref)
+{
+ struct bsg_class_device *bcd =
+ container_of(kref, struct bsg_class_device, ref);
+
+ if (bcd->release)
+ bcd->release(bcd->parent);
+
+ put_device(bcd->parent);
+}
+
static int bsg_put_device(struct bsg_device *bd)
{
- int ret = 0;
- struct device *dev = bd->queue->bsg_dev.dev;
+ int ret = 0, do_free;
+ struct request_queue *q = bd->queue;
mutex_lock(&bsg_mutex);
- if (!atomic_dec_and_test(&bd->ref_count))
+ do_free = atomic_dec_and_test(&bd->ref_count);
+ if (!do_free)
goto out;
dprintk("%s: tearing down\n", bd->name);
@@ -723,12 +735,13 @@ static int bsg_put_device(struct bsg_device *bd)
*/
ret = bsg_complete_all_commands(bd);
- blk_put_queue(bd->queue);
hlist_del(&bd->dev_list);
kfree(bd);
out:
mutex_unlock(&bsg_mutex);
- put_device(dev);
+ kref_put(&q->bsg_dev.ref, bsg_kref_release_function);
+ if (do_free)
+ blk_put_queue(q);
return ret;
}
@@ -796,7 +809,7 @@ static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
mutex_lock(&bsg_mutex);
bcd = idr_find(&bsg_minor_idr, iminor(inode));
if (bcd)
- get_device(bcd->dev);
+ kref_get(&bcd->ref);
mutex_unlock(&bsg_mutex);
if (!bcd)
@@ -808,7 +821,7 @@ static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
bd = bsg_add_device(inode, bcd->queue, file);
if (IS_ERR(bd))
- put_device(bcd->dev);
+ kref_put(&bcd->ref, bsg_kref_release_function);
return bd;
}
@@ -947,14 +960,14 @@ void bsg_unregister_queue(struct request_queue *q)
idr_remove(&bsg_minor_idr, bcd->minor);
sysfs_remove_link(&q->kobj, "bsg");
device_unregister(bcd->class_dev);
- put_device(bcd->dev);
bcd->class_dev = NULL;
+ kref_put(&bcd->ref, bsg_kref_release_function);
mutex_unlock(&bsg_mutex);
}
EXPORT_SYMBOL_GPL(bsg_unregister_queue);
-int bsg_register_queue(struct request_queue *q, struct device *gdev,
- const char *name)
+int bsg_register_queue(struct request_queue *q, struct device *parent,
+ const char *name, void (*release)(struct device *))
{
struct bsg_class_device *bcd;
dev_t dev;
@@ -965,7 +978,7 @@ int bsg_register_queue(struct request_queue *q, struct device *gdev,
if (name)
devname = name;
else
- devname = gdev->bus_id;
+ devname = parent->bus_id;
/*
* we need a proper transport to send commands, not a stacked device
@@ -996,9 +1009,11 @@ int bsg_register_queue(struct request_queue *q, struct device *gdev,
bcd->minor = minor;
bcd->queue = q;
- bcd->dev = get_device(gdev);
+ bcd->parent = get_device(parent);
+ bcd->release = release;
+ kref_init(&bcd->ref);
dev = MKDEV(bsg_major, bcd->minor);
- class_dev = device_create(bsg_class, gdev, dev, "%s", devname);
+ class_dev = device_create(bsg_class, parent, dev, "%s", devname);
if (IS_ERR(class_dev)) {
ret = PTR_ERR(class_dev);
goto put_dev;
@@ -1017,7 +1032,7 @@ int bsg_register_queue(struct request_queue *q, struct device *gdev,
unregister_class_dev:
device_unregister(class_dev);
put_dev:
- put_device(gdev);
+ put_device(parent);
remove_idr:
idr_remove(&bsg_minor_idr, minor);
unlock: