linux-kernel - Re: [PATCH v2] usb: dwc2: Fix build in periphal-only mode

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Date:   Fri, 28 May 2021 11:23:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Phil Elwell <phil@...pberrypi.com>
Cc:     Minas Harutyunyan <hminas@...opsys.com>,
        Sasha Levin <sashal@...nel.org>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: dwc2: Fix build in periphal-only mode

On Fri, May 28, 2021 at 10:13:50AM +0100, Phil Elwell wrote:
> The bus_suspended member of struct dwc2_hsotg is only present in builds
> that support host-mode.
> 
> Fixes: 24d209dba5a3 ("usb: dwc2: Fix hibernation between host and device modes.")
> Signed-off-by: Phil Elwell <phil@...pberrypi.com>
> ---
>  drivers/usb/dwc2/core_intr.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> v2: Correct commit hash used in the Fixes line.
> 
> diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
> index a5ab03808da6..03d0c034cf57 100644
> --- a/drivers/usb/dwc2/core_intr.c
> +++ b/drivers/usb/dwc2/core_intr.c
> @@ -725,7 +725,11 @@ static inline void dwc_handle_gpwrdn_disc_det(struct dwc2_hsotg *hsotg,
>  	dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
>  
>  	hsotg->hibernated = 0;
> +
> +#if IS_ENABLED(CONFIG_USB_DWC2_HOST) ||	\
> +	IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
>  	hsotg->bus_suspended = 0;
> +#endif
>  
>  	if (gpwrdn & GPWRDN_IDSTS) {
>  		hsotg->op_state = OTG_STATE_B_PERIPHERAL;
> -- 
> 2.25.1
> 

I do not understand, the field in the structure is present for all, why
is this crazy #if needed here?

I see that the commit you reference here did add the new line to set
bus_suspended, which seemed to be the point here.  Why will the #if
values matter here?

thanks,

greg k-h