Hello,
On Fri, 2022-11-18 at 13:27 +0530, Revanth Kumar Uppala wrote:
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 31ff35174034..e9f61bdaf7c4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -235,6 +235,12 @@ config DWMAC_INTEL_PLAT
> the stmmac device driver. This driver is used for the Intel Keem Bay
> SoC.
>
> +config DWMAC_TEGRA
> + tristate "NVIDIA Tegra MGBE support"
> + depends on ARCH_TEGRA || COMPILE_TEST
> + help
> + Support for the MGBE controller found on Tegra SoCs.
Minor nit: checkpatch is complaining for a more descriptive config
option text.
> +static int tegra_mgbe_probe(struct platform_device *pdev)
> +{
> + struct plat_stmmacenet_data *plat;
> + struct stmmac_resources res;
> + struct tegra_mgbe *mgbe;
> + int irq, err, i;
> + u32 value;
> +
> + mgbe = devm_kzalloc(&pdev->dev, sizeof(*mgbe), GFP_KERNEL);
> + if (!mgbe)
> + return -ENOMEM;
> +
> + mgbe->dev = &pdev->dev;
> +
> + memset(&res, 0, sizeof(res));
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + mgbe->hv = devm_platform_ioremap_resource_byname(pdev, "hypervisor");
> + if (IS_ERR(mgbe->hv))
> + return PTR_ERR(mgbe->hv);
> +
> + mgbe->regs = devm_platform_ioremap_resource_byname(pdev, "mac");
> + if (IS_ERR(mgbe->regs))
> + return PTR_ERR(mgbe->regs);
> +
> + mgbe->xpcs = devm_platform_ioremap_resource_byname(pdev, "xpcs");
> + if (IS_ERR(mgbe->xpcs))
> + return PTR_ERR(mgbe->xpcs);
> +
> + res.addr = mgbe->regs;
> + res.irq = irq;
> +
> + mgbe->clks = devm_kzalloc(&pdev->dev, sizeof(*mgbe->clks), GFP_KERNEL);
> + if (!mgbe->clks)
> + return -ENOMEM;
> +
> + for (i = 0; i < ARRAY_SIZE(mgbe_clks); i++)
> + mgbe->clks[i].id = mgbe_clks[i];
> +
> + err = devm_clk_bulk_get(mgbe->dev, ARRAY_SIZE(mgbe_clks), mgbe->clks);
> + if (err < 0)
> + return err;
> +
> + err = clk_bulk_prepare_enable(ARRAY_SIZE(mgbe_clks), mgbe->clks);
> + if (err < 0)
> + return err;
> +
> + /* Perform MAC reset */
> + mgbe->rst_mac = devm_reset_control_get(&pdev->dev, "mac");
> + if (IS_ERR(mgbe->rst_mac)) {
> + err = PTR_ERR(mgbe->rst_mac);
This triggers a clang warning:
../drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c:283:6: warning: variable 'plat' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
I guess you have to init plat to NULL and explcitly check for NULL
values under the 'remove' label.
Cheers,
Paolo
