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authorEd Cashin <ecashin@coraid.com>2013-01-12 06:43:35 -0500
committerBen Hutchings <ben@decadent.org.uk>2013-01-16 01:13:29 +0000
commitd9bc6299d6420b8b139127704372147a7d596494 (patch)
parent5afa0c0ec8b0db87309af1fa8a006ee343818b84 (diff)
aoe: do not call bdi_init after blk_alloc_queue
commit 0a41409c518083133e79015092585d68915865be upstream. blk_alloc_queue has already done a bdi_init, so do not bdi_init again in aoeblk_gdalloc. The extra call causes list corruption in the per-CPU backing dev info stats lists. Affected users see console WARNINGs about list_del corruption on percpu_counter_destroy when doing "rmmod aoe" or "aoeflush -a" when AoE targets have been detected and initialized by the system. The patch below applies to v3.6.11, with its v47 aoe driver. It is expected to apply to all currently maintained stable kernels except 3.7.y. A related but different fix has been posted for 3.7.y. References: RedHat bugzilla ticket with original report https://bugzilla.redhat.com/show_bug.cgi?id=853064 LKML discussion of bug and fix http://thread.gmane.org/gmane.linux.kernel/1416336/focus=1416497 Reported-by: Josh Boyer <jwboyer@redhat.com> Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2 files changed, 1 insertions, 6 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index db195abad698..e49ddd0aea12 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -1,5 +1,5 @@
/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
-#define VERSION "47"
+#define VERSION "47q"
#define AOE_MAJOR 152
#define DEVICE_NAME "aoe"
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 321de7b6c442..7eca46349c4c 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -276,8 +276,6 @@ aoeblk_gdalloc(void *vp)
goto err_mempool;
blk_queue_make_request(d->blkq, aoeblk_make_request);
d->blkq->backing_dev_info.name = "aoe";
- if (bdi_init(&d->blkq->backing_dev_info))
- goto err_blkq;
spin_lock_irqsave(&d->lock, flags);
gd->major = AOE_MAJOR;
gd->first_minor = d->sysminor * AOE_PARTITIONS;
@@ -298,9 +296,6 @@ aoeblk_gdalloc(void *vp)
- blk_cleanup_queue(d->blkq);
- d->blkq = NULL;