This is a note to let you know that I've just added the patch titled
mt76: mt7915: do not do any work in napi poll after calling napi_complete_done()
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mt76-mt7915-do-not-do-any-work-in-napi-poll-after-ca.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fb45dac66a5b5c77ebd3911d8763777bfc64a7e9
Author: Felix Fietkau <nbd@xxxxxxxx>
Date: Fri Aug 7 20:57:46 2020 +0200
mt76: mt7915: do not do any work in napi poll after calling napi_complete_done()
[ Upstream commit 38b04398c532e9bb9aa90fc07846ad0b0845fe94 ]
Fixes a race condition where multiple tx cleanup or sta poll tasks could run
in parallel.
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/dma.c b/drivers/net/wireless/mediatek/mt76/mt7915/dma.c
index a8832c5e60041..8a1ae08d9572e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/dma.c
@@ -95,16 +95,13 @@ static int mt7915_poll_tx(struct napi_struct *napi, int budget)
dev = container_of(napi, struct mt7915_dev, mt76.tx_napi);
mt7915_tx_cleanup(dev);
-
- if (napi_complete_done(napi, 0))
- mt7915_irq_enable(dev, MT_INT_TX_DONE_ALL);
-
- mt7915_tx_cleanup(dev);
-
mt7915_mac_sta_poll(dev);
tasklet_schedule(&dev->mt76.tx_tasklet);
+ if (napi_complete_done(napi, 0))
+ mt7915_irq_enable(dev, MT_INT_TX_DONE_ALL);
+
return 0;
}
