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__add_memory_block() calls both put_device() and device_unregister() when
storing the memory block into the xarray. This is incorrect because xarray
doesn't take an additional reference and device_unregister() already calls
put_device().
Triggering the issue looks really unlikely and its only effect should be to
log a spurious warning about a ref counted issue.
Fixes: 4fb6eabf1037 ("drivers/base/memory.c: cache memory blocks in xarray to accelerate lookup")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/d44c63d78affe844f020dc02ad6af29abc448fc4.1650611702.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>