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author | Ming Lei <ming.lei@redhat.com> | 2021-11-11 05:03:43 +0300 |
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committer | Jens Axboe <axboe@kernel.dk> | 2021-11-23 04:35:37 +0300 |
commit | efcf5932230b9472cfdbe01c858726f29ac5ec7d (patch) | |
tree | 81ebb94de5787993097f25294aa62fb3f426e22d /block/blk-cgroup-rwstat.h | |
parent | 2b504bd4841bccbf3eb83c1fec229b65956ad8ad (diff) | |
download | linux-efcf5932230b9472cfdbe01c858726f29ac5ec7d.tar.xz |
block: avoid to touch unloaded module instance when opening bdev
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.
This way is reasonable because blkdev_get_no_open() needn't to touch
disk->fops or defined callbacks.
Cc: Christoph Hellwig <hch@lst.de>
Cc: czhong@redhat.com
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211111020343.316126-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-cgroup-rwstat.h')
0 files changed, 0 insertions, 0 deletions