From: "Linus Lüssing" <linus.luessing@c0d3.blue>
To: b.a.t.m.a.n@lists.open-mesh.org
Subject: [B.A.T.M.A.N.] [PATCHv3 maint 1/5] batman-adv: Make DAT capability changes atomic
Date: Tue, 16 Jun 2015 15:17:19 +0200 [thread overview]
Message-ID: <1434460643-3681-2-git-send-email-linus.luessing@c0d3.blue> (raw)
In-Reply-To: <1434460643-3681-1-git-send-email-linus.luessing@c0d3.blue>
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 <linus.luessing@c0d3.blue>
---
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
next prev parent reply other threads:[~2015-06-16 13:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-16 13:17 [B.A.T.M.A.N.] [PATCHv3 maint 0/5] Fixes for parallel OGM processing Linus Lüssing
2015-06-16 13:17 ` Linus Lüssing [this message]
2015-06-16 13:17 ` [B.A.T.M.A.N.] [PATCHv3 maint 2/5] batman-adv: Make NC capability changes atomic Linus Lüssing
2015-06-16 13:17 ` [B.A.T.M.A.N.] [PATCHv3 maint 3/5] batman-adv: Make TT " Linus Lüssing
2015-06-16 13:17 ` [B.A.T.M.A.N.] [PATCHv3 maint 4/5] batman-adv: Make MCAST " Linus Lüssing
2015-06-16 13:17 ` [B.A.T.M.A.N.] [PATCHv3 maint 5/5] batman-adv: Fix potential synchronization issues in mcast tvlv handler Linus Lüssing
2015-06-16 14:12 ` Marek Lindner
2015-06-16 14:38 ` Marek Lindner
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