From: Greg Kroah-Hartman <gregkh@suse.de>
Date: Tue, 30 Jun 2009 19:08:20 +0000 (-0700)
Subject: .29 patch
X-Git-Tag: v2.6.27.26~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f7cba7f064a10643d06ab00b069ec512a298bf79;p=thirdparty%2Fkernel%2Fstable-queue.git

.29 patch
---

diff --git a/queue-2.6.29/dm-sysfs-skip-output-when-device-is-being-destroyed.patch b/queue-2.6.29/dm-sysfs-skip-output-when-device-is-being-destroyed.patch
new file mode 100644
index 00000000000..4f88803a9cf
--- /dev/null
+++ b/queue-2.6.29/dm-sysfs-skip-output-when-device-is-being-destroyed.patch
@@ -0,0 +1,36 @@
+From 4d89b7b4e4726893453d0fb4ddbb5b3e16353994 Mon Sep 17 00:00:00 2001
+From: Milan Broz <mbroz@redhat.com>
+Date: Mon, 22 Jun 2009 10:12:11 +0100
+Subject: dm: sysfs skip output when device is being destroyed
+
+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;
+ }
diff --git a/queue-2.6.29/series b/queue-2.6.29/series
index 9a7bcc5e6fd..4eeabe66b75 100644
--- a/queue-2.6.29/series
+++ b/queue-2.6.29/series
@@ -34,3 +34,4 @@ sound-seq_midi_event-fix-decoding-of-rpn-events.patch
 mm-fix-handling-of-pagesets-for-downed-cpus.patch
 dm-mpath-validate-table-argument-count.patch
 dm-mpath-validate-hw_handler-argument-count.patch
+dm-sysfs-skip-output-when-device-is-being-destroyed.patch