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| author | Jesper Dangaard Brouer <hawk@comx.dk> | 2009-09-23 15:57:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-24 07:21:05 -0700 |
| commit | 458e5ff13e1bed050990d97e9aa55bcdafc951a7 (patch) | |
| tree | 521d837beabe5265f070351a8ea42d48408ec5d7 /drivers/edac/edac_mc.c | |
| parent | dd8ef1db87a486577b3a76e6ad45df52e12d0145 (diff) | |
| download | kernel_samsung_smdk4412-458e5ff13e1bed050990d97e9aa55bcdafc951a7.zip kernel_samsung_smdk4412-458e5ff13e1bed050990d97e9aa55bcdafc951a7.tar.gz kernel_samsung_smdk4412-458e5ff13e1bed050990d97e9aa55bcdafc951a7.tar.bz2 | |
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>
Diffstat (limited to 'drivers/edac/edac_mc.c')
| -rw-r--r-- | drivers/edac/edac_mc.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c index 335b7eb..b629c41 100644 --- a/drivers/edac/edac_mc.c +++ b/drivers/edac/edac_mc.c @@ -418,16 +418,14 @@ static void complete_mc_list_del(struct rcu_head *head) mci = container_of(head, struct mem_ctl_info, rcu); INIT_LIST_HEAD(&mci->link); - complete(&mci->complete); } static void del_mc_from_global_list(struct mem_ctl_info *mci) { atomic_dec(&edac_handlers); list_del_rcu(&mci->link); - init_completion(&mci->complete); call_rcu(&mci->rcu, complete_mc_list_del); - wait_for_completion(&mci->complete); + rcu_barrier(); } /** |