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Message-ID: <1360663728-10296-1-git-send-email-nicolas.ferre@atmel.com> Date: Tue, 12 Feb 2013 11:08:48 +0100 From: Nicolas Ferre <nicolas.ferre@...el.com> To: "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org> CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>, <mailinglists@...inrol.com>, Nicolas Ferre <nicolas.ferre@...el.com> Subject: [PATCH] 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@...el.com> --- drivers/net/ethernet/cadence/macb.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index a9b0830..b9d4bb9 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -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 */ -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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