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[3.13.y-ckt,022/103] drivers: net: cpsw: enable interrupts after napi enable and clearing previous interrupts

Message ID 1424305990-17983-23-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa Feb. 19, 2015, 12:31 a.m. UTC 
3.13.11-ckt16 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mugunthan V N <mugunthanvnm@ti.com>

commit f63a975e8f07a75dbf0386402788330d0bebd8d8 upstream.

When the Ethernet interface is put down and up with heavy Ethernet
traffic, then there is prossibility of an interrupt waiting in irq
controller to be processed, so when the interface is brought up again
just after enable interrupt, it goes to ISR due to the previous
unhandled interrutp and in ISR napi is not scheduled as the napi
is not enabled in ndo_open which results in disabled interrupt for
CPSW and no packets are received in cpsw. So this patch moves enabling
of interupts after napi_enable and clearing CPDMA interrupts.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/net/ethernet/ti/cpsw.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 5330fd2..a6fb1c1 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1169,6 +1169,12 @@  static int cpsw_ndo_open(struct net_device *ndev)
 		cpsw_set_coalesce(ndev, &coal);
 	}
 
+	napi_enable(&priv->napi);
+	cpdma_ctlr_start(priv->dma);
+	cpsw_intr_enable(priv);
+	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
+	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX);
+
 	prim_cpsw = cpsw_get_slave_priv(priv, 0);
 	if (prim_cpsw->irq_enabled == false) {
 		if ((priv == prim_cpsw) || !netif_running(prim_cpsw->ndev)) {
@@ -1177,12 +1183,6 @@  static int cpsw_ndo_open(struct net_device *ndev)
 		}
 	}
 
-	napi_enable(&priv->napi);
-	cpdma_ctlr_start(priv->dma);
-	cpsw_intr_enable(priv);
-	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
-	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX);
-
 	if (priv->data.dual_emac)
 		priv->slaves[priv->emac_port].open_stat = true;
 	return 0;