[patch 096/108] dm: sysfs skip output when device is being destroyed

Greg KH
2009-07-01T01:15:37Z

[-- Attachment #1: dm-sysfs-skip-output-when-device-is-being-destroyed.patch --]
[-- Type: text/plain, Size: 850 bytes --]

2.6.30-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
@@ -1780,6 +1780,10 @@ 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;
}