Gitweb: http://git.kernel.org/linus/4d89b7b4e4726893453d0fb4ddbb5b3e16353994
Commit: 4d89b7b4e4726893453d0fb4ddbb5b3e16353994
Parent: e094f4f15f5169526c7200b9bde44b900548a81e
Author: Milan Broz <mbroz@redhat.com>
AuthorDate: Mon Jun 22 10:12:11 2009 +0100
Committer: Alasdair G Kergon <agk@redhat.com>
CommitDate: Mon Jun 22 10:12:11 2009 +0100
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: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---
drivers/md/dm.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 48db308..f1db689 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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;
}
--
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