net: macb: Clear interrupt flags

A few interrupt flags were not cleared in the ISR, resulting in a sytem
trapped in the ISR in cases one of those interrupts occurred. Clear all
flags to avoid such situations.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 18fdcd9d51b3..e38fe39d9589 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -951,6 +951,10 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
                 if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
                         macb_writel(bp, IDR, MACB_TX_INT_FLAGS);
                         schedule_work(&bp->tx_error_task);
+
+                        if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+                                macb_writel(bp, ISR, MACB_TX_ERR_FLAGS);
+
                         break;
                 }
 
@@ -968,6 +972,9 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
                                 bp->hw_stats.gem.rx_overruns++;
                         else
                                 bp->hw_stats.macb.rx_overruns++;
+
+                        if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+                                macb_writel(bp, ISR, MACB_BIT(ISR_ROVR));
                 }
 
                 if (status & MACB_BIT(HRESP)) {
@@ -977,6 +984,9 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
                          * (work queue?)
                          */
                         netdev_err(dev, "DMA bus error: HRESP not OK\n");
+
+                        if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+                                macb_writel(bp, ISR, MACB_BIT(HRESP));
                 }
 
                 status = macb_readl(bp, ISR);