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Date: Wed, 13 May 2015 17:01:36 -0500 From: Nathan Sullivan <nathan.sullivan@...com> To: nicolas.ferre@...el.com Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Nathan Sullivan <nathan.sullivan@...com> Subject: [PATCH] net: macb: Add better comment for RXUBR handling Describe the handler for RXUBR better with a new comment. Signed-off-by: Nathan Sullivan <nathan.sullivan@...com> Reviewied-by: Josh Cartwright <joshc@...com> Reviewied-by: Ben Shelton <ben.shelton@...com> --- drivers/net/ethernet/cadence/macb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index 61aa570..5f10dfc 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -1037,6 +1037,12 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id) * add that if/when we get our hands on a full-blown MII PHY. */ + /* There is a hardware issue under heavy load where DMA can + * stop, this causes endless "used buffer descriptor read" + * interrupts but it can be cleared by re-enabling RX. See + * the at91 manual, section 41.3.1 or the Zynq manual + * section 16.7.4 for details. + */ if (status & MACB_BIT(RXUBR)) { ctrl = macb_readl(bp, NCR); macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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