From 6358e093547c5d9f3dcc4e42ec88d48be6202e4c Mon Sep 17 00:00:00 2001
From: Yuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>
Date: Thu, 27 Jan 2022 21:17:14 +0900
Subject: [PATCH] net: stmmac: dwmac-visconti: No change to ETHER_CLOCK_SEL for
unexpected speed request.
commit 928d6fe996f69330ded6b887baf4534c5fac7988 upstream.
Variable clk_sel_val is not initialized in the default case of the first switch statement.
In that case, the function should return immediately without any changes to the hardware.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: b38dd98ff8d0 ("net: stmmac: Add Toshiba Visconti SoCs glue driver")
Signed-off-by: Yuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>
Reviewed-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
index 4578c64953eac..c27441c08dd6f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
@@ -49,13 +49,15 @@ struct visconti_eth {
void __iomem *reg;
u32 phy_intf_sel;
struct clk *phy_ref_clk;
+ struct device *dev;
spinlock_t lock; /* lock to protect register update */
};
static void visconti_eth_fix_mac_speed(void *priv, unsigned int speed)
{
struct visconti_eth *dwmac = priv;
- unsigned int val, clk_sel_val;
+ struct net_device *netdev = dev_get_drvdata(dwmac->dev);
+ unsigned int val, clk_sel_val = 0;
unsigned long flags;
spin_lock_irqsave(&dwmac->lock, flags);
@@ -85,7 +87,9 @@ static void visconti_eth_fix_mac_speed(void *priv, unsigned int speed)
break;
default:
/* No bit control */
- break;
+ netdev_err(netdev, "Unsupported speed request (%d)", speed);
+ spin_unlock_irqrestore(&dwmac->lock, flags);
+ return;
}
writel(val, dwmac->reg + MAC_CTRL_REG);
@@ -230,6 +234,7 @@ static int visconti_eth_dwmac_probe(struct platform_device *pdev)
spin_lock_init(&dwmac->lock);
dwmac->reg = stmmac_res.addr;
+ dwmac->dev = &pdev->dev;
plat_dat->bsp_priv = dwmac;
plat_dat->fix_mac_speed = visconti_eth_fix_mac_speed;
--
2.30.2