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wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses

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commit 39afc46c02 upstream.

PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7615_rx_check() and
mt7615_queue_rx_skb() dispatch it to mt7615_mac_tx_free() on every bus.
mt7615_mac_tx_free() cleans the DMA tx queues with
mt76_queue_tx_cleanup(), which calls queue_ops->tx_cleanup(). Only the
mmio queue ops implement that callback; on the mt7663 USB and SDIO
buses it is NULL, so a TXRX_NOTIFY there calls a NULL pointer in the RX
worker. Same defect as the mt7921 and mt7925 patches in this series.

Drop the event on non-mmio buses via mt76_is_mmio(), as in
commit 5683e1488a ("wifi: mt76: connac: do not check WED status for
non-mmio devices").

Fixes: eb99cc95c3 ("mt76: mt7615: introduce mt7663u support")
Cc: stable@vger.kernel.org
Signed-off-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Link: https://patch.msgid.link/20260627191336.20223-4-lucid_duck@justthetip.ca
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Devin Wittmayer
2026-08-03 11:15:27 +02:00
committed by Greg Kroah-Hartman
parent 584c8954ad
commit f2a72f47c5
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+6
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@@ -1612,6 +1612,8 @@ bool mt7615_rx_check(struct mt76_dev *mdev, void *data, int len)
switch (type) {
case PKT_TYPE_TXRX_NOTIFY:
if (!mt76_is_mmio(mdev))
return false;
mt7615_mac_tx_free(dev, data, len);
return false;
case PKT_TYPE_TXS:
@@ -1645,6 +1647,10 @@ void mt7615_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,
dev_kfree_skb(skb);
break;
case PKT_TYPE_TXRX_NOTIFY:
if (!mt76_is_mmio(mdev)) {
dev_kfree_skb(skb);
break;
}
mt7615_mac_tx_free(dev, skb->data, skb->len);
dev_kfree_skb(skb);
break;