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From:   Serge Semin <Sergey.Semin@baikalelectronics.ru>
To:     Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        "David S. Miller" <davem@davemloft.net>,
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        Joao Pinto <Joao.Pinto@synopsys.com>,
        Jose Abreu <Jose.Abreu@synopsys.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>
CC:     Serge Semin <Sergey.Semin@baikalelectronics.ru>,
        Serge Semin <fancer.lancer@gmail.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        Vyacheslav Mitrofanov 
        <Vyacheslav.Mitrofanov@baikalelectronics.ru>,
        Russell King <linux@armlinux.org.uk>,
        Andrew Lunn <andrew@lunn.ch>,
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        <linux-kernel@vger.kernel.org>
Subject: [PATCH 11/20] net: stmmac: Discard index usage in the dirty_rx init
Date:   Mon, 8 Feb 2021 17:03:32 +0300
Message-ID: <20210208140341.9271-12-Sergey.Semin@baikalelectronics.ru>
In-Reply-To: <20210208140341.9271-1-Sergey.Semin@baikalelectronics.ru>
References: <20210208140341.9271-1-Sergey.Semin@baikalelectronics.ru>
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Indeed in accordance with the initialization loop logics the statement
"(i - priv->dma_rx_size)" will always equal to zero. Just initialize the
dirty_rx pointer with zero then.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8599ef6df52f..abe8db9965f4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1412,7 +1412,7 @@ static int init_dma_rx_desc_rings(struct net_device *dev, gfp_t flags)
 		}
 
 		rx_q->cur_rx = 0;
-		rx_q->dirty_rx = (unsigned int)(i - priv->dma_rx_size);
+		rx_q->dirty_rx = 0;
 
 		/* Setup the chained descriptor addresses */
 		if (priv->mode == STMMAC_CHAIN_MODE) {
-- 
2.29.2