@@ -128,6 +128,9 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
if (!get_mtd_device(NULL, dev->mtd->index))
goto out;
+ if (dev->open++)
+ goto out;
+
if (!try_module_get(tr->owner))
goto out_tr;
@@ -153,6 +156,10 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
struct mtd_blktrans_ops *tr = dev->tr;
int ret = 0;
+ dev->open--;
+ if (dev->open)
+ return 0;
+
if (tr->release)
ret = tr->release(dev);
@@ -304,6 +311,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
if (new->readonly)
set_disk_ro(gd, 1);
+ new->open = 0;
add_disk(gd);
return 0;
@@ -332,6 +340,17 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
/* Stop the thread */
kthread_stop(old->thread);
+
+ if (old->open) {
+ if (old->tr->release)
+ old->tr->release(old);
+ put_mtd_device(old->mtd);
+ }
+
+ /* From now on, no calls into trans can be made */
+ /* Mtd device will be gone real soon now */
+ old->mtd = NULL;
+
blk_cleanup_queue(old->rq);
return 0;
@@ -24,6 +24,7 @@ struct mtd_blktrans_dev {
int devnum;
unsigned long size;
int readonly;
+ int open;
struct gendisk *disk;
struct task_struct *thread;
struct request_queue *rq;