From 37a68e001578ed1cd7def6a0666f60d2aade4f26 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 5 Dec 2019 17:46:42 +0100
Subject: [PATCH] mt76: disable bh in mt76_dma_rx_poll
Git-commit: 37a68e001578ed1cd7def6a0666f60d2aade4f26
Patch-mainline: v5.7-rc1
References: jsc#SLE-13430
Fixes potential RCU issues and avoids calling ieee80211_rx_napi with softirq
enabled.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/mediatek/mt76/dma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
index 2298a4e91943..9e03a7871ff4 100644
--- 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);
--
2.16.4