mt76: disable bh in mt76_dma_rx_poll

Fixes potential RCU issues and avoids calling ieee80211_rx_napi with softirq
enabled.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
index 2298a4e..9e03a78 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/dma.c
@@ -538,6 +538,7 @@ mt76_dma_rx_poll(struct napi_struct *napi, int budget)
        dev = container_of(napi->dev, struct mt76_dev, napi_dev);
        qid = napi - dev->napi;
 
+       local_bh_disable();
        rcu_read_lock();
 
        do {
@@ -547,6 +548,7 @@ mt76_dma_rx_poll(struct napi_struct *napi, int budget)
        } while (cur && done < budget);
 
        rcu_read_unlock();
+       local_bh_enable();
 
        if (done < budget && napi_complete(napi))
                dev->drv->rx_poll_complete(dev, qid);