netdev - [PATCH net-next 1/2] net: stmmac: fix unsafe MTL DMA macro

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Date:   Fri, 21 Oct 2022 19:47:10 +0800
From:   Junxiao Chang <junxiao.chang@...el.com>
To:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
        Joao.Pinto@...opsys.com, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     junxiao.chang@...el.com
Subject: [PATCH net-next 1/2] net: stmmac: fix unsafe MTL DMA macro

Macro like "#define abc(x) (x, x)" is unsafe which might introduce
side effects. Each MTL RxQ DMA channel mask is 4 bits, so using
(0xf << chan) instead of GENMASK(x + 3, x) to avoid unsafe macro.

Fixes: d43042f4da3e ("net: stmmac: mapping mtl rx to dma channel")
Signed-off-by: Junxiao Chang <junxiao.chang@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index 71dad409f78b0..3c1490408a1c3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
@@ -333,7 +333,7 @@ enum power_event {
 #define MTL_RXQ_DMA_MAP1		0x00000c34 /* queue 4 to 7 */
 #define MTL_RXQ_DMA_Q04MDMACH_MASK	GENMASK(3, 0)
 #define MTL_RXQ_DMA_Q04MDMACH(x)	((x) << 0)
-#define MTL_RXQ_DMA_QXMDMACH_MASK(x)	GENMASK(11 + (8 * ((x) - 1)), 8 * (x))
+#define MTL_RXQ_DMA_QXMDMACH_MASK(x)	(0xf << 8 * (x))
 #define MTL_RXQ_DMA_QXMDMACH(chan, q)	((chan) << (8 * (q)))
 
 #define MTL_CHAN_BASE_ADDR		0x00000d00
-- 
2.25.1