Re: [PATCH v3] usb: dwc3: qcom: check for hcd in dwc3_qcom_read_usb2_speed

[Thinh Nguyen <Thinh.Nguyen@synopsys.com>]

On Thu, Oct 22, 2026, Prashanth K wrote:
> Currently dwc->xhci is not cleared if xhci_plat_probe() fails. During
> system suspend, dwc3_qcom_read_usb2_speed() checks dwc->xhci and assumes
> xhci is initialised. Since the probe failed, hcd will be null, and the
> subsequent access results in a NULL pointer dereference
> 
> Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000058
> 
> Call trace:
>   dwc3_qcom_pm_suspend
>   dpm_run_callback
>   device_suspend
>   dpm_suspend
>   dpm_suspend_start
>   suspend_devices_and_enter
>   pm_suspend
> 
> Explicitly check the hcd pointer in dwc3_qcom_read_usb2_speed
> before accessing it.
> 
> Fixes: 6895ea55c385 ("usb: dwc3: qcom: Configure wakeup interrupts during suspend")
> Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com>
> ---

Can we add Cc stable?

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

Thanks,
Thinh