From f7ea10520d7dacbc416d130c4b10505c66bf4c36 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Fri, 30 Aug 2013 16:49:25 -0500 Subject: [PATCH] net: calxedaxgmac: enable interrupts after napi_enable Fix a race condition where the interrupt handler may have called napi_schedule before napi_enable is called. This would disable interrupts and never actually schedule napi to run. Reported-by: Lennert Buytenhek Signed-off-by: Rob Herring Signed-off-by: David S. Miller --- drivers/net/ethernet/calxeda/xgmac.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c index 5d0b61a..73d3f83 100644 --- a/drivers/net/ethernet/calxeda/xgmac.c +++ b/drivers/net/ethernet/calxeda/xgmac.c @@ -959,9 +959,7 @@ static int xgmac_hw_init(struct net_device *dev) DMA_BUS_MODE_FB | DMA_BUS_MODE_ATDS | DMA_BUS_MODE_AAL; writel(value, ioaddr + XGMAC_DMA_BUS_MODE); - /* Enable interrupts */ - writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS); - writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA); + writel(0, ioaddr + XGMAC_DMA_INTR_ENA); /* Mask power mgt interrupt */ writel(XGMAC_INT_STAT_PMTIM, ioaddr + XGMAC_INT_STAT); @@ -1029,6 +1027,10 @@ static int xgmac_open(struct net_device *dev) napi_enable(&priv->napi); netif_start_queue(dev); + /* Enable interrupts */ + writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS); + writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA); + return 0; } -- 2.7.4