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authorRob Herring <rob.herring@calxeda.com>2013-08-30 23:49:25 +0200
committerDavid S. Miller <davem@davemloft.net>2013-09-04 04:21:15 +0200
commitf7ea10520d7dacbc416d130c4b10505c66bf4c36 (patch)
tree22fc089169eec46e71464711ee823e5c5272a2a0 /drivers/net/ethernet/calxeda
parentnet: calxedaxgmac: fix race with tx queue stop/wake (diff)
downloadlinux-f7ea10520d7dacbc416d130c4b10505c66bf4c36.tar.xz
linux-f7ea10520d7dacbc416d130c4b10505c66bf4c36.zip
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 <buytenh@wantstofly.org> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/calxeda')
-rw-r--r--drivers/net/ethernet/calxeda/xgmac.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 5d0b61a5c72b..73d3f83468c4 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;
}