lib: Ensure EWMA does not store wrong intermediate values
authorMichael Dalton <mwdalton@google.com>
Fri, 17 Jan 2014 06:23:29 +0000 (22:23 -0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 17 Jan 2014 07:46:06 +0000 (23:46 -0800)
commit03144b5869d2921dafbea477246aeb5d4eb5fc38
treec0326022d8ccf711afb495c9c556447dfcf845b7
parenta953be53ce40440acb4740edb48577b9468d4c3d
lib: Ensure EWMA does not store wrong intermediate values

To ensure ewma_read() without a lock returns a valid but possibly
out of date average, modify ewma_add() by using ACCESS_ONCE to prevent
intermediate wrong values from being written to avg->internal.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Michael Dalton <mwdalton@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
lib/average.c