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wifi: mt76: mt7921u: escalate broken USB transport to device reset

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Check the USB control path before running the normal WFSYS reset flow.

If USB access is no longer reliable, stop the WFSYS-only reset path,
mark the device as bus_hung, and queue a USB device reset instead.

Reuse the existing bus_hung state to represent transport-level failure,
keeping the semantics consistent with the SDIO path.

Also initialize bus_hung explicitly during probe for consistency.

Reported-by: Bryam Vargas <[email protected]>
Closes: https://lore.kernel.org/r/CANAPQziOh3sB7B8G+U3AZsFfeFN1uAg4munhwA_feZi56D7W+Q@mail.gmail.com
Signed-off-by: Sean Wang <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Sean Wang
2026-06-02 13:22:04 +02:00
committed by Felix Fietkau
parent 600dbf1233
commit 91f19ba393
4 changed files with 35 additions and 1 deletions
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mt7921/usb.c
+5
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@@ -88,6 +88,10 @@ static int mt7921u_mac_reset(struct mt792x_dev *dev)
{
int err;
mt792xu_reset_on_bus_error(dev);
if (atomic_read(&dev->mt76.bus_hung))
return 0;
mt76_txq_schedule_all(&dev->mphy);
mt76_worker_disable(&dev->mt76.tx_worker);
@@ -196,6 +200,7 @@ static int mt7921u_probe(struct usb_interface *usb_intf,
dev = container_of(mdev, struct mt792x_dev, mt76);
dev->fw_features = features;
dev->hif_ops = &hif_ops;
atomic_set(&dev->mt76.bus_hung, false);
mt792xu_reset_work_init(dev);
usb_reset_device(udev);