From: Luis Chamberlain <mcgrof@kernel.org>
Date: Fri, 19 Jun 2020 20:47:27 +0000
Subject: [PATCH] loop: be paranoid on exit and prevent new additions /
Git-commit: 200f93377220504c5e56754823e7adfea6037f1a
Patch-mainline: v5.9-rc1
References: bsc#1175995,jsc#SLE-15608
removals
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/block/loop.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 4acae248790c..a943207705dd 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2404,6 +2404,8 @@ 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);
@@ -2411,6 +2413,8 @@ static void __exit loop_exit(void)
unregister_blkdev(LOOP_MAJOR, "loop");
misc_deregister(&loop_misc);
+
+ mutex_unlock(&loop_ctl_mutex);
}
module_init(loop_init);
--
2.16.4