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dm: sysfs skip output when device is being destroyed

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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: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz 2009-06-22 10:12:11 +01:00 committed by Alasdair G Kergon
parent e094f4f15f
commit 4d89b7b4e4
1 changed files with 4 additions and 0 deletions
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4
drivers/md/dm.c
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@ -1777,6 +1777,10 @@ struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
if (&md->kobj != kobj)
return NULL;
if (test_bit(DMF_FREEING, &md->flags) ||
test_bit(DMF_DELETING, &md->flags))
return NULL;
dm_get(md);
return md;
}