From b226a826d83d66806fae20fc3518dace8b86bacb Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Fri, 22 Nov 2019 12:42:42 +0100
Subject: [PATCH] mac80211: add a comment about monitor-to-dev injection
Git-commit: b226a826d83d66806fae20fc3518dace8b86bacb
Patch-mainline: v5.5-rc1
References: jsc#SLE-13430
Add a note with a use-case for the monitor-to-dev injection
mechanism in mac80211, reported by Ben Greear.
Change-id: I6456997ef9bc40b24ede860b6ef2fed5af49cf44
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/mac80211/tx.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index db38be1b75fa..a53af8cd3756 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2270,6 +2270,9 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
* isn't always enough to find the interface to use; for proper
* VLAN/WDS support we will need a different mechanism (which
* likely isn't going to be monitor interfaces).
+ *
+ * This is necessary, for example, for old hostapd versions that
+ * don't use nl80211-based management TX/RX.
*/
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
--
2.16.4