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net: stmmac: Prevent divide-by-zero 

When RX Coalesce settings are set to all zero (which is a valid setting)
we will currently get a divide-by-zero error. Fix it.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
alistair/sunxi64-5.4-dsi
Jose Abreu 2019-09-10 16:41:22 +02:00 committed by David S. Miller
parent e7f13f44c7
commit 6fa9d691b9
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -3418,7 +3418,9 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
stmmac_refill_desc3(priv, rx_q, p);
rx_q->rx_count_frames++;
rx_q->rx_count_frames %= priv->rx_coal_frames;
rx_q->rx_count_frames += priv->rx_coal_frames;
if (rx_q->rx_count_frames > priv->rx_coal_frames)
rx_q->rx_count_frames = 0;
use_rx_wd = priv->use_riwt && rx_q->rx_count_frames;
dma_wmb();