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net: macb: Add better comment for RXUBR handling

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Describe the handler for RXUBR better with a new comment.

Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Reviewied-by: Josh Cartwright <joshc@ni.com>
Reviewied-by: Ben Shelton <ben.shelton@ni.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nathan Sullivan 2015-05-13 17:01:36 -05:00 committed by David S. Miller
parent eea39946a1
commit 86b5e7de07
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/cadence/macb.c
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@ -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));