[B.A.T.M.A.N.] [PATCHv4 maint 2/5] batman-adv: Make NC capability changes atomic

[Linus Lüssing]

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: 7dd9d8992b0c ("batman-adv: tvlv - add network coding container")
Signed-off-by: Linus Lüssing <linus.luess...@c0d3.blue>
---
 network-coding.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/network-coding.c b/network-coding.c
index 89e1d47..3ce493e 100644
--- a/network-coding.c
+++ b/network-coding.c
@@ -105,9 +105,9 @@ static void batadv_nc_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_NC;
+               clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities);
        else
-               orig->capabilities |= BATADV_ORIG_CAPA_HAS_NC;
+               set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities);
 }
 
 /**
-- 
1.7.10.4