diff options
| author | santosh.shilimkar@oracle.com <santosh.shilimkar@oracle.com> | 2016-04-14 10:43:27 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-16 19:01:05 -0400 |
| commit | e47db94e10447fc467777a40302f2b393e9af2fa (patch) | |
| tree | 4c7df86e01d04d5ba6ec19a764807ca6b5a92261 /net/rds/cong.c | |
| parent | a7c556546f610a331c22cb7edd9d1afe63f0cd52 (diff) | |
| download | blackbird-op-linux-e47db94e10447fc467777a40302f2b393e9af2fa.tar.gz blackbird-op-linux-e47db94e10447fc467777a40302f2b393e9af2fa.zip | |
RDS: Fix the atomicity for congestion map update
Two different threads with different rds sockets may be in
rds_recv_rcvbuf_delta() via receive path. If their ports
both map to the same word in the congestion map, then
using non-atomic ops to update it could cause the map to
be incorrect. Lets use atomics to avoid such an issue.
Full credit to Wengang <wen.gang.wang@oracle.com> for
finding the issue, analysing it and also pointing out
to offending code with spin lock based fix.
Reviewed-by: Leon Romanovsky <leon@leon.nu>
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/cong.c')
| -rw-r--r-- | net/rds/cong.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/rds/cong.c b/net/rds/cong.c index e6144b8246fd..6641bcf7c185 100644 --- a/net/rds/cong.c +++ b/net/rds/cong.c @@ -299,7 +299,7 @@ void rds_cong_set_bit(struct rds_cong_map *map, __be16 port) i = be16_to_cpu(port) / RDS_CONG_MAP_PAGE_BITS; off = be16_to_cpu(port) % RDS_CONG_MAP_PAGE_BITS; - __set_bit_le(off, (void *)map->m_page_addrs[i]); + set_bit_le(off, (void *)map->m_page_addrs[i]); } void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port) @@ -313,7 +313,7 @@ void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port) i = be16_to_cpu(port) / RDS_CONG_MAP_PAGE_BITS; off = be16_to_cpu(port) % RDS_CONG_MAP_PAGE_BITS; - __clear_bit_le(off, (void *)map->m_page_addrs[i]); + clear_bit_le(off, (void *)map->m_page_addrs[i]); } static int rds_cong_test_bit(struct rds_cong_map *map, __be16 port) |
