Re: [PATCH v7 6/8] usb: misc: qcom_eud: add role-based EUD control

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 8/31/26 5:01 AM, Elson Serrao wrote:
> EUD functions by presenting itself as a USB device to the host PC and is
> therefore only applicable when the port operates in device role. Keeping
> EUD enabled in other roles provides no benefit and unnecessarily keeps
> the associated PHY resources enabled. Furthermore, enabling EUD in host
> role can cause the USB controller to misbehave because the EUD hub
> supports only a single upstream-facing port.

[...]

>  	struct eud_chip *chip = dev_get_drvdata(dev);
> +	struct eud_path *path;
>  	bool enable;
>  	int ret;
>  
>  	if (kstrtobool(buf, &enable))
>  		return -EINVAL;
>  
> +	guard(mutex)(&chip->state_lock);

GPT suggests port_store() should also take this lock.. I think that's
a valid concern

Konrad