net/ethernet: cpsw: Bugfix interrupts before enabling napi

If interrupts happen before napi_enable was called, the driver will not
work as expected. Network transmissions are impossible in this state.
This bug can be reproduced easily by restarting the network interface in
a loop. After some time any network transmissions on the network
interface will fail.

This patch fixes the bug by enabling napi before enabling the network
interface interrupts.

Signed-off-by: Markus Pargmann <[e-mail]>
Acked-by: Peter Korsgaard <[e-mail]>
Acked-by: Mugunthan V N <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/ti/cpsw.c

···
 		}
 	}
 
+	napi_enable(&priv->napi);
 	cpdma_ctlr_start(priv->dma);
 	cpsw_intr_enable(priv);
-	napi_enable(&priv->napi);
 	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
 	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX);