wifi: mac80211: handle HW restart during ROC

If we have a HW restart in the middle of a ROC period,
then there are two cases:
 - if it's a software ROC, we really don't need to do
   anything, since the ROC work will still be queued
   and will run later, albeit with the interruption
   due to the restart;
 - if it's a hardware ROC, then it may have begun or
   not, if it did begin already we can only remove it
   and tell userspace about that.

In both cases, this fixes the warning that would appear
in ieee80211_start_next_roc() in this case.

In the case of some drivers such as iwlwifi, the part of
restarting is never going to happen since the driver will
cancel the ROC, but flushing the work to ensure nothing
is pending here will also result in no longer being able
to trigger the warning in this case.

Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240523120352.f1924b5411ea.Ifc02a45a5ce23868dc7e428bad8d0e6996dd10f4@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 34 insertions, 1 deletions

diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c
index 65e1e9e971fd..28d03196ef75 100644
--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -8,7 +8,7 @@
  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
- * Copyright (C) 2019, 2022-2023 Intel Corporation
+ * Copyright (C) 2019, 2022-2024 Intel Corporation
  */
 #include <linux/export.h>
 #include <net/mac80211.h>
@@ -413,6 +413,39 @@ void ieee80211_start_next_roc(struct ieee80211_local *local)
 	}
 }
 
+void ieee80211_reconfig_roc(struct ieee80211_local *local)
+{
+	struct ieee80211_roc_work *roc, *tmp;
+
+	/*
+	 * In the software implementation can just continue with the
+	 * interruption due to reconfig, roc_work is still queued if
+	 * needed.
+	 */
+	if (!local->ops->remain_on_channel)
+		return;
+
+	/* flush work so nothing from the driver is still pending */
+	wiphy_work_flush(local->hw.wiphy, &local->hw_roc_start);
+	wiphy_work_flush(local->hw.wiphy, &local->hw_roc_done);
+
+	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
+		if (!roc->started)
+			break;
+
+		if (!roc->hw_begun) {
+			/* it didn't start in HW yet, so we can restart it */
+			roc->started = false;
+			continue;
+		}
+
+		/* otherwise destroy it and tell userspace */
+		ieee80211_roc_notify_destroy(roc);
+	}
+
+	ieee80211_start_next_roc(local);
+}
+
 static void __ieee80211_roc_work(struct ieee80211_local *local)
 {
 	struct ieee80211_roc_work *roc;