[5/5] wifi: iwlwifi: mvm: don't send an ROC command with max_delay = 0

Commit Message

Miri Korenblit July 3, 2024, 3:43 a.m. UTC

From: Emmanuel Grumbach <[e-mail]>

The firmware can't handle that (it will crash with ASSERT 300A).
This happened because we looked at vif->bss_conf which is not
the right bss_conf to look at in case of an MLD connection.
Fix iwl_mvm_roc_duration_and_delay to iterate on the active links to
get the right value for the dtim_interval.

Signed-off-by: Emmanuel Grumbach <[e-mail]>
Signed-off-by: Miri Korenblit <[e-mail]>
Reviewed-by: Johannes Berg <[e-mail]>
---
 .../net/wireless/intel/iwlwifi/mvm/time-event.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c b/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
index 31bc80cdcb7d..97cfd72312f2 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
@@ -984,12 +984,21 @@  void iwl_mvm_roc_duration_and_delay(struct ieee80211_vif *vif,
 				    u32 *duration_tu,
 				    u32 *delay)
 {
-	u32 dtim_interval = vif->bss_conf.dtim_period *
-		vif->bss_conf.beacon_int;
+	struct ieee80211_bss_conf *link_conf;
+	unsigned int link_id;
+	u32 dtim_interval = 0;
 
 	*delay = AUX_ROC_MIN_DELAY;
 	*duration_tu = MSEC_TO_TU(duration_ms);
 
+	rcu_read_lock();
+	for_each_vif_active_link(vif, link_conf, link_id) {
+		dtim_interval =
+			max_t(u32, dtim_interval,
+			      link_conf->dtim_period * link_conf->beacon_int);
+	}
+	rcu_read_unlock();
+
 	/*
 	 * If we are associated we want the delay time to be at least one
 	 * dtim interval so that the FW can wait until after the DTIM and
@@ -998,8 +1007,10 @@  void iwl_mvm_roc_duration_and_delay(struct ieee80211_vif *vif,
 	 * Since we want to use almost a whole dtim interval we would also
 	 * like the delay to be for 2-3 dtim intervals, in case there are
 	 * other time events with higher priority.
+	 * dtim_interval should never be 0, it can be 1 if we don't know it
+	 * (we haven't heard any beacon yet).
 	 */
-	if (vif->cfg.assoc) {
+	if (vif->cfg.assoc && !WARN_ON(!dtim_interval)) {
 		*delay = min_t(u32, dtim_interval * 3, AUX_ROC_MAX_DELAY);
 		/* We cannot remain off-channel longer than the DTIM interval */
 		if (dtim_interval <= *duration_tu) {