From: Benjamin Beichler <benjamin.beichler@uni-rostock.de>
Date: Fri, 11 Nov 2016 16:37:56 +0000 (+0100)
Subject: mac80211_hwsim: fix beacon delta calculation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4fb7f8af1f4c14a2a6cee7c9ff0cf999d918c72d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

mac80211_hwsim: fix beacon delta calculation

Due to the cast from uint32_t to int64_t, a wrong next beacon timing is
calculated and effectively the beacon timer stops working. This is
especially bad for 802.11s mesh networks, because discovery breaks
without beacons.

Signed-off-by: Benjamin Beichler <benjamin.beichler@uni-rostock.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 431f13b4faf6..d3bad5779376 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -826,7 +826,7 @@ static void mac80211_hwsim_set_tsf(struct ieee80211_hw *hw,
 		data->bcn_delta = do_div(delta, bcn_int);
 	} else {
 		data->tsf_offset -= delta;
-		data->bcn_delta = -do_div(delta, bcn_int);
+		data->bcn_delta = -(s64)do_div(delta, bcn_int);
 	}
 }