linux-kernel - Re: [PATCH 1/3] usb: dwc2: drd: fix dwc2_force_mode call in dwc2_ovr

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Date:   Fri, 15 Oct 2021 10:53:49 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Subject: Re: [PATCH 1/3] usb: dwc2: drd: fix dwc2_force_mode call in
 dwc2_ovr_init

On 10/5/2021 1:53 PM, Amelie Delaunay wrote:
> Instead of forcing the role to Device, check the dr_mode configuration.
> If the core is Host only, force the mode to Host, this to avoid the
> dwc2_force_mode warning:
> WARNING: CPU: 1 PID: 21 at drivers/usb/dwc2/core.c:615 dwc2_drd_init+0x104/0x17c
> 
> When forcing mode to Host, dwc2_force_mode may sleep the time the host
> role is applied. To avoid sleeping while atomic context, move the call
> to dwc2_force_mode after spin_unlock_irqrestore. It is safe, as
> interrupts are not yet unmasked here.
> 
> Fixes: 17f934024e84 ("usb: dwc2: override PHY input signals with usb role switch support")
> Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>

> ---
>   drivers/usb/dwc2/drd.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/drd.c b/drivers/usb/dwc2/drd.c
> index 2d4176f5788e..80eae88d76dd 100644
> --- a/drivers/usb/dwc2/drd.c
> +++ b/drivers/usb/dwc2/drd.c
> @@ -25,9 +25,9 @@ static void dwc2_ovr_init(struct dwc2_hsotg *hsotg)
>   	gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL);
>   	dwc2_writel(hsotg, gotgctl, GOTGCTL);
>   
> -	dwc2_force_mode(hsotg, false);
> -
>   	spin_unlock_irqrestore(&hsotg->lock, flags);
> +
> +	dwc2_force_mode(hsotg, (hsotg->dr_mode == USB_DR_MODE_HOST));
>   }
>   
>   static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid)
>