Merge branch 'fb' into devel

[linux.git] / block / bsg.c

diff --git a/block/bsg.c b/block/bsg.c
index 302ac1f5af391b7058aad198615cdf1fee29931d..f0b7cd3432160203ea6c650088ccfcd4acf2a3f6 100644 (file)
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -57,7 +57,7 @@ enum {
 #undef BSG_DEBUG
 
 #ifdef BSG_DEBUG
-#define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args)
+#define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args)
 #else
 #define dprintk(fmt, args...)
 #endif
@@ -174,7 +174,11 @@ unlock:
 static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
                                struct sg_io_v4 *hdr, int has_write_perm)
 {
-       memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
+       if (hdr->request_len > BLK_MAX_CDB) {
+               rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL);
+               if (!rq->cmd)
+                       return -ENOMEM;
+       }
 
        if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
                           hdr->request_len))
@@ -211,8 +215,6 @@ bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw)
 
        if (hdr->guard != 'Q')
                return -EINVAL;
-       if (hdr->request_len > BLK_MAX_CDB)
-               return -EINVAL;
        if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
            hdr->din_xfer_len > (q->max_sectors << 9))
                return -EIO;
@@ -302,6 +304,8 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
        }
        return rq;
 out:
+       if (rq->cmd != rq->__cmd)
+               kfree(rq->cmd);
        blk_put_request(rq);
        if (next_rq) {
                blk_rq_unmap_user(next_rq->bio);
@@ -455,6 +459,8 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
                ret = rq->errors;
 
        blk_rq_unmap_user(bio);
+       if (rq->cmd != rq->__cmd)
+               kfree(rq->cmd);
        blk_put_request(rq);
 
        return ret;
@@ -699,14 +705,26 @@ 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 +741,13 @@ 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;
 }
 
@@ -758,7 +777,7 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
        mutex_lock(&bsg_mutex);
        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);
 
@@ -796,7 +815,7 @@ 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 +827,7 @@ 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;
 }
@@ -946,26 +965,26 @@ 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;
+       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
@@ -996,10 +1015,11 @@ 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;
@@ -1016,9 +1036,9 @@ 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: