net: stmmac: fix INTR TBU status affecting irq count statistic

DMA channel status "Transmit buffer unavailable(TBU)" bit is not
considered as a successful dma tx. Hence, it should not affect
all the irq count statistic.

Fixes: 1103d3a5531c ("net: stmmac: dwmac4: Also use TBU interrupt to clean TX path")
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
Signed-off-by: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
index e632702..f83db62 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
@@ -172,11 +172,12 @@ int dwmac4_dma_interrupt(void __iomem *ioaddr,
                x->rx_normal_irq_n++;
                ret |= handle_rx;
        }
-       if (likely(intr_status & (DMA_CHAN_STATUS_TI |
-               DMA_CHAN_STATUS_TBU))) {
+       if (likely(intr_status & DMA_CHAN_STATUS_TI)) {
                x->tx_normal_irq_n++;
                ret |= handle_tx;
        }
+       if (unlikely(intr_status & DMA_CHAN_STATUS_TBU))
+               ret |= handle_tx;
        if (unlikely(intr_status & DMA_CHAN_STATUS_ERI))
                x->rx_early_irq++;