Re: [PATCH v1 1/3] mmc: msm_sdhci: fix max-frequency read into wrong-sized variable

Hi Aswin,

On 27-08-2026 13:03, Aswin Murugan wrote:
> msm_sdc_clk_init() reads the "max-frequency" DT property with
> dev_read_u32(dev, "max-frequency", (uint *)(&clk_rate)), writing
> only 4 bytes into clk_rate, an 8-byte ulong. The upper 4 bytes are
> left uninitialized whenever the property is present. Read into a
> u32 local instead, then assign it to clk_rate.
>
> Signed-off-by: Aswin Murugan<[email protected]>
> ---
>   drivers/mmc/msm_sdhci.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c
> index 7bdb02142a2..cbf565be426 100644
> --- a/drivers/mmc/msm_sdhci.c
> +++ b/drivers/mmc/msm_sdhci.c
> @@ -65,12 +65,15 @@ static int msm_sdc_clk_init(struct udevice *dev)
>   	struct msm_sdhc *prv = dev_get_priv(dev);
>   	const struct msm_sdhc_variant_info *var_info;
>   	ulong clk_rate;
> +	u32 max_frequency;
>   	int ret, i = 0, n_clks;
>   	const char *clk_name;
>   
>   	var_info = (void *)dev_get_driver_data(dev);
>   
> -	if (dev_read_u32(dev, "max-frequency", (uint *)(&clk_rate)))
> +	if (!dev_read_u32(node, "max-frequency", &max_frequency))
> +		clk_rate = max_frequency;
> +	else
>   		clk_rate = 201500000;
The clean implementation would be:
clk_rate = dev_read_u32_default(dev, "max-frequency", 201500000);