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Diffstat (limited to 'block/bsg.c')
-rw-r--r--block/bsg.c96
1 files changed, 58 insertions, 38 deletions
diff --git a/block/bsg.c b/block/bsg.c
index 8917c5174dc2..23ea4fd1a66d 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -37,7 +37,6 @@ struct bsg_device {
struct list_head done_list;
struct hlist_node dev_list;
atomic_t ref_count;
- int minor;
int queued_cmds;
int done_cmds;
wait_queue_head_t wq_done;
@@ -368,7 +367,7 @@ static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
spin_lock_irq(&bd->lock);
if (bd->done_cmds) {
- bc = list_entry(bd->done_list.next, struct bsg_command, list);
+ bc = list_first_entry(&bd->done_list, struct bsg_command, list);
list_del(&bc->list);
bd->done_cmds--;
}
@@ -468,8 +467,6 @@ static int bsg_complete_all_commands(struct bsg_device *bd)
dprintk("%s: entered\n", bd->name);
- set_bit(BSG_F_BLOCK, &bd->flags);
-
/*
* wait for all commands to complete
*/
@@ -702,13 +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;
+ 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);
@@ -725,11 +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);
+ kref_put(&q->bsg_dev.ref, bsg_kref_release_function);
+ if (do_free)
+ blk_put_queue(q);
return ret;
}
@@ -738,24 +750,28 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
struct file *file)
{
struct bsg_device *bd;
+ int ret;
#ifdef BSG_DEBUG
unsigned char buf[32];
#endif
+ ret = blk_get_queue(rq);
+ if (ret)
+ return ERR_PTR(-ENXIO);
bd = bsg_alloc_device();
- if (!bd)
+ if (!bd) {
+ blk_put_queue(rq);
return ERR_PTR(-ENOMEM);
+ }
bd->queue = rq;
- kobject_get(&rq->kobj);
bsg_set_block(bd, file);
atomic_set(&bd->ref_count, 1);
- bd->minor = iminor(inode);
mutex_lock(&bsg_mutex);
- hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(bd->minor));
+ hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode)));
- strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
+ strncpy(bd->name, rq->bsg_dev.class_dev->bus_id, sizeof(bd->name) - 1);
dprintk("bound to <%s>, max queue %d\n",
format_dev_t(buf, inode->i_rdev), bd->max_queue);
@@ -763,23 +779,21 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
return bd;
}
-static struct bsg_device *__bsg_get_device(int minor)
+static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q)
{
- struct bsg_device *bd = NULL;
+ struct bsg_device *bd;
struct hlist_node *entry;
mutex_lock(&bsg_mutex);
- hlist_for_each(entry, bsg_dev_idx_hash(minor)) {
- bd = hlist_entry(entry, struct bsg_device, dev_list);
- if (bd->minor == minor) {
+ hlist_for_each_entry(bd, entry, bsg_dev_idx_hash(minor), dev_list) {
+ if (bd->queue == q) {
atomic_inc(&bd->ref_count);
- break;
+ goto found;
}
-
- bd = NULL;
}
-
+ bd = NULL;
+found:
mutex_unlock(&bsg_mutex);
return bd;
}
@@ -789,21 +803,27 @@ static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
struct bsg_device *bd;
struct bsg_class_device *bcd;
- bd = __bsg_get_device(iminor(inode));
- if (bd)
- return bd;
-
/*
* find the class device
*/
mutex_lock(&bsg_mutex);
bcd = idr_find(&bsg_minor_idr, iminor(inode));
+ if (bcd)
+ kref_get(&bcd->ref);
mutex_unlock(&bsg_mutex);
if (!bcd)
return ERR_PTR(-ENODEV);
- return bsg_add_device(inode, bcd->queue, file);
+ bd = __bsg_get_device(iminor(inode), bcd->queue);
+ if (bd)
+ return bd;
+
+ bd = bsg_add_device(inode, bcd->queue, file);
+ if (IS_ERR(bd))
+ kref_put(&bcd->ref, bsg_kref_release_function);
+
+ return bd;
}
static int bsg_open(struct inode *inode, struct file *file)
@@ -939,27 +959,26 @@ void bsg_unregister_queue(struct request_queue *q)
mutex_lock(&bsg_mutex);
idr_remove(&bsg_minor_idr, bcd->minor);
sysfs_remove_link(&q->kobj, "bsg");
- class_device_unregister(bcd->class_dev);
- put_device(bcd->dev);
+ device_unregister(bcd->class_dev);
bcd->class_dev = NULL;
- bcd->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;
int ret, minor;
- struct class_device *class_dev = NULL;
+ struct device *class_dev = NULL;
const char *devname;
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
@@ -990,10 +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 = class_device_create(bsg_class, NULL, dev, gdev, "%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;
@@ -1010,9 +1030,9 @@ int bsg_register_queue(struct request_queue *q, struct device *gdev,
return 0;
unregister_class_dev:
- class_device_unregister(class_dev);
+ device_unregister(class_dev);
put_dev:
- put_device(gdev);
+ put_device(parent);
remove_idr:
idr_remove(&bsg_minor_idr, minor);
unlock:
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 09:53:26 +0300