Commit 8770e91a authored Feb 12, 2013 by Nicolas Ferre Committed by David S. Miller Feb 13, 2013

net/macb: fix race with RX interrupt while doing NAPI



When interrupts are disabled, an RX condition can occur but
it is not reported when enabling interrupts again. We need to check
RSR and use napi_reschedule() if condition is met.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent ac574804

drivers/net/ethernet/cadence/macb.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -693,6 +693,11 @@ static int macb_poll(struct napi_struct *napi, int budget)
		* get notified when new packets arrive.
		*/
		macb_writel(bp, IER, MACB_RX_INT_FLAGS);

		/* Packets received while interrupts were disabled */
		status = macb_readl(bp, RSR);
		if (unlikely(status))
		napi_reschedule(napi);
		}

		/* TODO: Handle errors */