Re: [PATCH] usb: dwc3: imx: avoid calling imx suspend/resume callbacks twice

[Thinh Nguyen]

On Tue, Mar 17, 2026, Xu Yang wrote:
> If a runtime suspend is executed followed by a system suspend, the driver
> may invoke dwc3_imx_suspend() twice, which causes enable_irq() to be
> called twice as well. This leads to an unbalanced IRQ state and may
> trigger warnings or malfunction. Prevent this by checking the pm_suspended
> flag before running the imx suspend/resume path.
> 
> Fixes: 76fc9452a6bf ("usb: dwc3: introduce flatten model driver of i.MX Soc")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Xu Yang <xu.yang_2@xxxxxxx>
> ---
>  drivers/usb/dwc3/dwc3-imx.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-imx.c b/drivers/usb/dwc3/dwc3-imx.c
> index 303708f7d79a..973a486b544d 100644
> --- a/drivers/usb/dwc3/dwc3-imx.c
> +++ b/drivers/usb/dwc3/dwc3-imx.c
> @@ -288,6 +288,9 @@ static void dwc3_imx_remove(struct platform_device *pdev)
>  
>  static void dwc3_imx_suspend(struct dwc3_imx *dwc_imx, pm_message_t msg)
>  {
> +	if (dwc_imx->pm_suspended)
> +		return;
> +
>  	if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc_imx->dev))
>  		dwc3_imx_wakeup_enable(dwc_imx, msg);
>  
> @@ -299,6 +302,9 @@ static void dwc3_imx_resume(struct dwc3_imx *dwc_imx, pm_message_t msg)
>  {
>  	struct dwc3	*dwc = &dwc_imx->dwc;
>  
> +	if (!dwc_imx->pm_suspended)
> +		return;
> +
>  	dwc_imx->pm_suspended = false;
>  	if (!dwc_imx->wakeup_pending)
>  		disable_irq_nosync(dwc_imx->irq);
> -- 
> 2.34.1
> 

Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>

BR,
Thinh