Dear Maintainers,

while trying to fix #986837 we found another issue in the aoe driver:
Removal of an active aoe device leads to a page fault and inhibits the
removal of the aoe module.
The issue affects all kernels from v4.20-rc1 up to v5.14-rc1 including
5.10 currently in debian bullseye.
The code in freedev() calls blk_mq_free_tag_set() before running
blk_cleanup_queue() which leads to this issue (drivers/block/aoedev.c
L281ff).
The attached patch for affected kernel versions just changes the order
of function calls to match the one introduced with blk_cleanup_disk() to
mitigate this issue.
See also https://bugzilla.kernel.org/show_bug.cgi?id=215647

Cheers,
Valentin