From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: =?UTF-8?q?Linus=20L=C3=BCssing?= Date: Tue, 16 Jun 2015 15:17:19 +0200 Message-Id: <1434460643-3681-2-git-send-email-linus.luessing@c0d3.blue> In-Reply-To: <1434460643-3681-1-git-send-email-linus.luessing@c0d3.blue> References: <1434460643-3681-1-git-send-email-linus.luessing@c0d3.blue> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Subject: [B.A.T.M.A.N.] [PATCHv3 maint 1/5] batman-adv: Make DAT capability changes atomic Reply-To: The list for a Better Approach To Mobile Ad-hoc Networking List-Id: The list for a Better Approach To Mobile Ad-hoc Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: b.a.t.m.a.n@lists.open-mesh.org Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One OGM handler might undo the set/clear of a specific bit from another handler run in between. Fix this by using the atomic set_bit()/clear_bit() functions. Fixes: 2b1c07b918d2 ("batman-adv: tvlv - add distributed arp table container") Signed-off-by: Linus Lüssing --- distributed-arp-table.c | 4 ++-- types.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/distributed-arp-table.c b/distributed-arp-table.c index 0d791dc..b2cc19b 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -682,9 +682,9 @@ static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, uint16_t tvlv_value_len) { if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) - orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_DAT; + clear_bit(BATADV_ORIG_CAPA_HAS_DAT, &orig->capabilities); else - orig->capabilities |= BATADV_ORIG_CAPA_HAS_DAT; + set_bit(BATADV_ORIG_CAPA_HAS_DAT, &orig->capabilities); } /** diff --git a/types.h b/types.h index 28f2461..e33b5aa 100644 --- a/types.h +++ b/types.h @@ -256,7 +256,7 @@ struct batadv_orig_node { struct hlist_node mcast_want_all_ipv4_node; struct hlist_node mcast_want_all_ipv6_node; #endif - uint8_t capabilities; + unsigned long capabilities; uint8_t capa_initialized; atomic_t last_ttvn; unsigned char *tt_buff; -- 1.7.10.4