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Subject[patch 35/35] dm: sysfs skip output when device is being destroyed
2.6.29-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Milan Broz <mbroz@redhat.com>

commit 4d89b7b4e4726893453d0fb4ddbb5b3e16353994 upstream.

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.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/md/dm.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1728,6 +1728,10 @@ struct mapped_device *dm_get_from_kobjec
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;
}



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