dm: sysfs skip output when device is being destroyed
Do not process sysfs attributes when device is being destroyed. Otherwise code can cause BUG_ON(test_bit(DMF_FREEING, &md->flags)); in dm_put() call. Cc: stable@kernel.org Signed-off-by: NMilan Broz <mbroz@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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