5.15-stable review patch. If anyone has any objections, please let me know.
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From: Louis-Alexis Eyraud louisalexis.eyraud@collabora.com
[ Upstream commit e54b4db35e201a9173da9cb7abc8377e12abaf87 ]
In mtk_star_rx_poll function, on event processing completion, the mtk_star_emac driver calls napi_complete_done but ignores its return code and enable RX DMA interrupts inconditionally. This return code gives the info if a device should avoid rearming its interrupts or not, so fix this behaviour by taking it into account.
Fixes: 8c7bd5a454ff ("net: ethernet: mtk-star-emac: new driver") Signed-off-by: Louis-Alexis Eyraud louisalexis.eyraud@collabora.com Acked-by: Bartosz Golaszewski bartosz.golaszewski@linaro.org Link: https://patch.msgid.link/20250424-mtk_star_emac-fix-spinlock-recursion-issue... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/mediatek/mtk_star_emac.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_star_emac.c b/drivers/net/ethernet/mediatek/mtk_star_emac.c index c7155e0102232..639cf1c27dbd4 100644 --- a/drivers/net/ethernet/mediatek/mtk_star_emac.c +++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c @@ -1338,8 +1338,7 @@ static int mtk_star_rx_poll(struct napi_struct *napi, int budget) priv = container_of(napi, struct mtk_star_priv, rx_napi);
work_done = mtk_star_rx(priv, budget); - if (work_done < budget) { - napi_complete_done(napi, work_done); + if (work_done < budget && napi_complete_done(napi, work_done)) { spin_lock_irqsave(&priv->lock, flags); mtk_star_enable_dma_irq(priv, true, false); spin_unlock_irqrestore(&priv->lock, flags);