#include <scsi/scsi_driver.h>
#include <scsi/sg.h>
-const static char bsg_version[] = "block layer sg (bsg) 0.4";
+#define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver"
+#define BSG_VERSION "0.4"
struct bsg_device {
request_queue_t *queue;
static int bsg_device_nr, bsg_minor_idx;
#define BSG_LIST_ARRAY_SIZE 8
-#define bsg_list_idx(minor) ((minor) & (BSG_LIST_ARRAY_SIZE - 1))
static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE];
static struct class *bsg_class;
return bc;
}
-static inline void
-bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
+static inline struct hlist_head *bsg_dev_idx_hash(int index)
{
+ return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)];
}
static int bsg_io_schedule(struct bsg_device *bd)
atomic_set(&bd->ref_count, 1);
bd->minor = iminor(inode);
mutex_lock(&bsg_mutex);
- hlist_add_head(&bd->dev_list,
- &bsg_device_list[bd->minor & (BSG_LIST_ARRAY_SIZE - 1)]);
+ hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(bd->minor));
strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
dprintk("bound to <%s>, max queue %d\n",
static struct bsg_device *__bsg_get_device(int minor)
{
- struct hlist_head *list;
struct bsg_device *bd = NULL;
struct hlist_node *entry;
mutex_lock(&bsg_mutex);
- list = &bsg_device_list[minor & (BSG_LIST_ARRAY_SIZE - 1)];
- hlist_for_each(entry, list) {
+ hlist_for_each(entry, bsg_dev_idx_hash(minor)) {
bd = hlist_entry(entry, struct bsg_device, dev_list);
if (bd->minor == minor) {
atomic_inc(&bd->ref_count);
{
struct bsg_class_device *bcd = &q->bsg_dev;
- WARN_ON(!bcd->class_dev);
+ if (!bcd->class_dev)
+ return;
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
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;
if (q->kobj.sd) {
ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
if (ret)
- goto err;
+ goto err_unregister;
}
list_add_tail(&bcd->list, &bsg_class_list);
mutex_unlock(&bsg_mutex);
return 0;
+
+err_unregister:
+ class_device_unregister(class_dev);
+err_put:
+ put_device(gdev);
err:
- if (class_dev)
- class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor));
mutex_unlock(&bsg_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(bsg_register_queue);
-static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
-{
- int ret;
- struct scsi_device *sdp = to_scsi_device(cl_dev->dev);
- struct request_queue *rq = sdp->request_queue;
-
- if (rq->kobj.parent)
- ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent));
- else
- ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj));
- return ret;
-}
-
-static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
-{
- bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue);
-}
-
-static struct class_interface bsg_intf = {
- .add = bsg_add,
- .remove = bsg_remove,
-};
-
static struct cdev bsg_cdev = {
.kobj = {.name = "bsg", },
.owner = THIS_MODULE,
dev_t devid;
bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
- sizeof(struct bsg_command), 0, 0, NULL, NULL);
+ sizeof(struct bsg_command), 0, 0, NULL);
if (!bsg_cmd_cachep) {
printk(KERN_ERR "bsg: failed creating slab cache\n");
return -ENOMEM;
bsg_class = class_create(THIS_MODULE, "bsg");
if (IS_ERR(bsg_class)) {
- kmem_cache_destroy(bsg_cmd_cachep);
- return PTR_ERR(bsg_class);
+ ret = PTR_ERR(bsg_class);
+ goto destroy_kmemcache;
}
ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg");
- if (ret) {
- kmem_cache_destroy(bsg_cmd_cachep);
- class_destroy(bsg_class);
- return ret;
- }
+ if (ret)
+ goto destroy_bsg_class;
bsg_major = MAJOR(devid);
cdev_init(&bsg_cdev, &bsg_fops);
ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS);
- if (ret) {
- kmem_cache_destroy(bsg_cmd_cachep);
- class_destroy(bsg_class);
- unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS);
- return ret;
- }
-
- ret = scsi_register_interface(&bsg_intf);
- if (ret) {
- printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
- kmem_cache_destroy(bsg_cmd_cachep);
- class_destroy(bsg_class);
- unregister_chrdev(bsg_major, "bsg");
- return ret;
- }
+ if (ret)
+ goto unregister_chrdev;
- printk(KERN_INFO "%s loaded (major %d)\n", bsg_version, bsg_major);
+ printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION
+ " loaded (major %d)\n", bsg_major);
return 0;
+unregister_chrdev:
+ unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS);
+destroy_bsg_class:
+ class_destroy(bsg_class);
+destroy_kmemcache:
+ kmem_cache_destroy(bsg_cmd_cachep);
+ return ret;
}
MODULE_AUTHOR("Jens Axboe");
-MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
+MODULE_DESCRIPTION(BSG_DESCRIPTION);
MODULE_LICENSE("GPL");
device_initcall(bsg_init);
projects / powerpc.git / blobdiff