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[PW_SID:1136904] netdev: Fix premature ECSA channel switch timeout for mt7925 #510

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[PW_SID:1136904] netdev: Fix premature ECSA channel switch timeout for mt7925 #510

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20 changes: 20 additions & 0 deletions src/netdev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5428,12 +5428,32 @@ static void netdev_channel_switch_event(struct l_genl_msg *msg,
{
_auto_(l_free) struct band_chandef *chandef = NULL;

uint32_t count;
const char *driver;

if (netdev->type != NL80211_IFTYPE_STATION)
return;

if (L_WARN_ON(!netdev->connected))
return;

driver = wiphy_get_driver(netdev_get_wiphy(netdev));

/*
* If the channel switch countdown is present, the switch is imminent
* but has not happened yet. Wait for the second CH_SWITCH_NOTIFY
* event (which omits the count) to avoid interrupting the firmware
* by prematurely starting a scan.
*
* Restrict this workaround to mt7925 cards as requested.
*/
if (driver && !strncmp(driver, "mt7925", 6) &&
nl80211_parse_attrs(msg, NL80211_ATTR_CH_SWITCH_COUNT, &count,
NL80211_ATTR_UNSPEC) == 0) {
l_debug("Channel switch imminent in %u TBTTs, waiting...", count);
return;
}

chandef = l_new(struct band_chandef, 1);

if (nl80211_parse_chandef(msg, chandef) < 0) {
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