On Thu, 11 Nov 2021 10:03:43 +0800, Ming Lei wrote:
> disk->fops->owner is grabbed in blkdev_get_no_open() after the disk
> kobject refcount is increased. This way can't make sure that
> disk->fops->owner is still alive since del_gendisk() still can move
> on if the kobject refcount of disk is grabbed by open() and
> disk->fops->open() isn't called yet.
>
> Fixes the issue by moving try_module_get() into blkdev_get_by_dev()
> with ->open_mutex() held, then we can drain the in-progress open()
> in del_gendisk(). Meantime new open() won't succeed because disk
> becomes not alive.
>
> [...]
Applied, thanks!
[1/1] block: avoid to touch unloaded module instance when opening bdev
(no commit info)
Best regards,
--
Jens Axboe
