netdev - [PATCH net-next] net: stmmac: mostly remove "buf

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Message-Id: <E1tpswn-005U6I-TU@rmk-PC.armlinux.org.uk>
Date: Wed, 05 Mar 2025 17:54:21 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next] net: stmmac: mostly remove "buf_sz"

The "buf_sz" parameter is not used in the stmmac driver - there is one
place where the value of buf_sz is validated, and two places where it
is written. It is otherwise unused.

Remove these accesses. However, leave the module parameter in place as
removing it could cause module load to fail, breaking user setups.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index cb5099caecd0..037039a9a33b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -101,6 +101,7 @@ static int tc = TC_DEFAULT;
 module_param(tc, int, 0644);
 MODULE_PARM_DESC(tc, "DMA threshold control value");
 
+/* This is unused */
 #define	DEFAULT_BUFSIZE	1536
 static int buf_sz = DEFAULT_BUFSIZE;
 module_param(buf_sz, int, 0644);
@@ -218,8 +219,6 @@ static void stmmac_verify_args(void)
 {
 	if (unlikely(watchdog < 0))
 		watchdog = TX_TIMEO;
-	if (unlikely((buf_sz < DEFAULT_BUFSIZE) || (buf_sz > BUF_SIZE_16KiB)))
-		buf_sz = DEFAULT_BUFSIZE;
 	if (unlikely((pause < 0) || (pause > 0xffff)))
 		pause = PAUSE_TIME;
 
@@ -4018,7 +4017,6 @@ static int __stmmac_open(struct net_device *dev,
 		}
 	}
 
-	buf_sz = dma_conf->dma_buf_sz;
 	for (int i = 0; i < MTL_MAX_TX_QUEUES; i++)
 		if (priv->dma_conf.tx_queue[i].tbs & STMMAC_TBS_EN)
 			dma_conf->tx_queue[i].tbs = priv->dma_conf.tx_queue[i].tbs;
@@ -7973,9 +7971,6 @@ static int __init stmmac_cmdline_opt(char *str)
 		} else if (!strncmp(opt, "phyaddr:", 8)) {
 			if (kstrtoint(opt + 8, 0, &phyaddr))
 				goto err;
-		} else if (!strncmp(opt, "buf_sz:", 7)) {
-			if (kstrtoint(opt + 7, 0, &buf_sz))
-				goto err;
 		} else if (!strncmp(opt, "tc:", 3)) {
 			if (kstrtoint(opt + 3, 0, &tc))
 				goto err;
-- 
2.30.2