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From:   gregory.greenman@intel.com
To:     johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org,
        Johannes Berg <johannes.berg@intel.com>,
        Gregory Greenman <gregory.greenman@intel.com>
Subject: [PATCH 07/11] wifi: mac80211_hwsim: avoid warning with MLO PS stations
Date:   Thu,  4 May 2023 16:45:07 +0300
Message-Id: <20230504134511.828474-8-gregory.greenman@intel.com>
In-Reply-To: <20230504134511.828474-1-gregory.greenman@intel.com>
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From: Johannes Berg <johannes.berg@intel.com>

If the station disables all links it's in powersave and
we shouldn't transmit anything to it, but we don't handle
that correctly yet. For now, just avoid the warning, once
we really add support for this case we can revert to the
old warning.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/virtual/mac80211_hwsim.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/virtual/mac80211_hwsim.c b/drivers/net/wireless/virtual/mac80211_hwsim.c
index 2211fa58fe41..4f44d87a5c13 100644
--- a/drivers/net/wireless/virtual/mac80211_hwsim.c
+++ b/drivers/net/wireless/virtual/mac80211_hwsim.c
@@ -1940,7 +1940,14 @@ static void mac80211_hwsim_tx(struct ieee80211_hw *hw,
 								 hdr, &link_sta);
 		}
 
-		if (WARN_ON(!bss_conf)) {
+		if (unlikely(!bss_conf)) {
+			/* if it's an MLO STA, it might have deactivated all
+			 * links temporarily - but we don't handle real PS in
+			 * this code yet, so just drop the frame in that case
+			 */
+			WARN(link != IEEE80211_LINK_UNSPECIFIED || !sta || !sta->mlo,
+			     "link:%d, sta:%pM, sta->mlo:%d\n",
+			     link, sta ? sta->addr : NULL, sta ? sta->mlo : -1);
 			ieee80211_free_txskb(hw, skb);
 			return;
 		}
-- 
2.38.1