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loop: be paranoid on exit and prevent new additions / removals 

[ Upstream commit 200f933772 ]

Be pedantic on removal as well and hold the mutex.
This should prevent uses of addition while we exit.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Luis Chamberlain 2020-06-19 20:47:27 +00:00 committed by Greg Kroah-Hartman
parent 0e656b7e85
commit a661981013
1 changed files with 4 additions and 0 deletions
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4
drivers/block/loop.c
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@ -2325,6 +2325,8 @@ static void __exit loop_exit(void)
range = max_loop ? max_loop << part_shift : 1UL << MINORBITS;
mutex_lock(&loop_ctl_mutex);
idr_for_each(&loop_index_idr, &loop_exit_cb, NULL);
idr_destroy(&loop_index_idr);
@ -2332,6 +2334,8 @@ static void __exit loop_exit(void)
unregister_blkdev(LOOP_MAJOR, "loop");
misc_deregister(&loop_misc);
mutex_unlock(&loop_ctl_mutex);
}
module_init(loop_init);