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Commit 07002e99 authored by Al Viro's avatar Al Viro Committed by Linus Torvalds
Browse files

fix the dynamic allocation and probe in loop.c 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Acked-by: default avatarKen Chen <kenchen@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f1d1a842

drivers/block/loop.c

+12 −40
Original line number Diff line number Diff line
@@ -1317,18 +1317,6 @@ static long lo_compat_ioctl(struct file *file, unsigned int cmd, unsigned long a 
}

#endif



static struct loop_device *loop_find_dev(int number)

{

	struct loop_device *lo;



	list_for_each_entry(lo, &loop_devices, lo_list) {

		if (lo->lo_number == number)

			return lo;

	}

	return NULL;

}



static struct loop_device *loop_init_one(int i);

static int lo_open(struct inode *inode, struct file *file)

{

	struct loop_device *lo = inode->i_bdev->bd_disk->private_data;
@@ -1337,11 +1325,6 @@ static int lo_open(struct inode *inode, struct file *file) 
	lo->lo_refcnt++;

	mutex_unlock(&lo->lo_ctl_mutex);



	mutex_lock(&loop_devices_mutex);

	if (!loop_find_dev(lo->lo_number + 1))

		loop_init_one(lo->lo_number + 1);

	mutex_unlock(&loop_devices_mutex);



	return 0;

}
@@ -1448,7 +1431,7 @@ static struct loop_device *loop_init_one(int i) 
out_free_dev:

	kfree(lo);

out:

	return ERR_PTR(-ENOMEM);

	return NULL;

}



static void loop_del_one(struct loop_device *lo)
@@ -1460,36 +1443,30 @@ static void loop_del_one(struct loop_device *lo) 
	kfree(lo);

}



static int loop_lock(dev_t dev, void *data)

{

	mutex_lock(&loop_devices_mutex);

	return 0;

}



static struct kobject *loop_probe(dev_t dev, int *part, void *data)

{

	unsigned int number = dev & MINORMASK;

	struct loop_device *lo;

	struct loop_device *lo = loop_init_one(dev & MINORMASK);

	struct kobject *kobj;



	mutex_lock(&loop_devices_mutex);

	lo = loop_find_dev(number);

	if (lo == NULL)

		lo = loop_init_one(number);

	kobj = lo ? get_disk(lo->lo_disk) : ERR_PTR(-ENOMEM);

	mutex_unlock(&loop_devices_mutex);



	*part = 0;

	if (IS_ERR(lo))

		return (void *)lo;

	else

		return &lo->lo_disk->kobj;

	return kobj;

}



static int __init loop_init(void)

{

	struct loop_device *lo;



	if (register_blkdev(LOOP_MAJOR, "loop"))

		return -EIO;

	blk_register_region(MKDEV(LOOP_MAJOR, 0), 1UL << MINORBITS,

				  THIS_MODULE, loop_probe, NULL, NULL);



	lo = loop_init_one(0);

	if (IS_ERR(lo))

		goto out;

				  THIS_MODULE, loop_probe, loop_lock, NULL);



	if (max_loop) {

		printk(KERN_INFO "loop: the max_loop option is obsolete "
@@ -1498,11 +1475,6 @@ static int __init loop_init(void) 
	}

	printk(KERN_INFO "loop: module loaded\n");

	return 0;



out:

	unregister_blkdev(LOOP_MAJOR, "loop");

	printk(KERN_ERR "loop: ran out of memory\n");

	return -ENOMEM;

}



static void __exit loop_exit(void)