edac: core: remove completion-wait for complete with rcu_barrier
authorJesper Dangaard Brouer <hawk@comx.dk>
Wed, 23 Sep 2009 22:57:29 +0000 (15:57 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 24 Sep 2009 14:21:05 +0000 (07:21 -0700)
commit458e5ff13e1bed050990d97e9aa55bcdafc951a7
tree521d837beabe5265f070351a8ea42d48408ec5d7
parentdd8ef1db87a486577b3a76e6ad45df52e12d0145
edac: core: remove completion-wait for complete with rcu_barrier

Module edac_core.ko uses call_rcu() callbacks in edac_device.c, edac_mc.c
and edac_pci.c.

They all use a wait_for_completion() scheme, but this scheme it not 100%
safe on multiple CPUs.  See the _rcu_barrier() implementation which
explains why extra precausion is needed.

The patch adds a comment about rcu_barrier() and as a precausion calls
rcu_barrier().  A maintainer needs to look at removing the
wait_for_completion code.

[dougthompson@xmission.com: remove the wait_for_completion code]
Signed-off-by Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/edac/edac_device.c
drivers/edac/edac_mc.c
drivers/edac/edac_pci.c