[PATCH] net: txgbe: use vector 0 for misc interrupts without MSI-X

In non-MSI-X mode, queue and miscellaneous interrupts share vector 0.
TXGBE_INTR_MISC(wx) instead selects the MSI-X-only miscellaneous vector,
leaving vector 0 masked after it is serviced. Use BIT(0) for the
non-MSI-X fallback at each miscellaneous interrupt unmask site.

Fixes: e37546ad1f9b ("net: wangxun: revert the adjustment of the IRQ
vector sequence")
Signed-off-by: Diego Fernando Mancera Gomez <[email protected]>
---
 drivers/net/ethernet/wangxun/txgbe/txgbe_irq.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_irq.c
b/drivers/net/ethernet/wangxun/txgbe/txgbe_irq.c
index 8746318ad3bc..6b5542cb2161 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_irq.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_irq.c
@@ -31,7 +31,10 @@ void txgbe_irq_enable(struct wx *wx, bool queues)
 	wr32(wx, WX_PX_MISC_IEN, misc_ien);

 	/* unmask interrupt */
-	wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
+	if (wx->pdev->msix_enabled)
+		wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
+	else
+		wx_intr_enable(wx, BIT(0));
 	if (queues)
 		wx_intr_enable(wx, TXGBE_INTR_QALL(wx));
 }
@@ -183,7 +186,10 @@ static irqreturn_t txgbe_misc_irq_thread_fn(int
irq, void *data)
 		nhandled++;
 	}

-	wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
+	if (wx->pdev->msix_enabled)
+		wx_intr_enable(wx, TXGBE_INTR_MISC(wx));
+	else
+		wx_intr_enable(wx, BIT(0));
 	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
 }
-- 
2.54.0.windows.1