net: stmmac: dwmac-visconti: No change to ETHER_CLOCK_SEL for unexpected speed request.

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>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
index dde5b77..c3f10a9 100644 (file)
--- 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);
@@ -229,6 +233,7 @@ 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;