linux-kernel - Re: [PATCH v2 1/2] usb: dwc3: gadget: Bail out in pullup if soft reset timeout happens

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Message-ID: <20230426010631.fnncmfiywlm6jsws@synopsys.com>
Date:   Wed, 26 Apr 2023 01:06:33 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Colin Ian King <colin.i.king@...il.com>,
        Jiantao Zhang <water.zhangjiantao@...wei.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "quic_ppratap@...cinc.com" <quic_ppratap@...cinc.com>,
        "quic_wcheng@...cinc.com" <quic_wcheng@...cinc.com>,
        "quic_jackp@...cinc.com" <quic_jackp@...cinc.com>,
        "quic_ugoswami@...cinc.com" <quic_ugoswami@...cinc.com>
Subject: Re: [PATCH v2 1/2] usb: dwc3: gadget: Bail out in pullup if soft
 reset timeout happens

On Tue, Mar 28, 2023, Krishna Kurapati wrote:
> If the core soft reset timeout happens, avoid setting up event
> buffers and starting gadget as the writes to these registers
> may not reflect when in reset and setting the run stop bit
> can lead the controller to access wrong event buffer address
> resulting in a crash.
> 
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
>  drivers/usb/dwc3/gadget.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 3c63fa97a680..f0472801d9a5 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2620,13 +2620,16 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
>  		 * device-initiated disconnect requires a core soft reset
>  		 * (DCTL.CSftRst) before enabling the run/stop bit.
>  		 */
> -		dwc3_core_soft_reset(dwc);
> +		ret = dwc3_core_soft_reset(dwc);
> +		if (ret)
> +			goto done;
>  
>  		dwc3_event_buffers_setup(dwc);
>  		__dwc3_gadget_start(dwc);
>  		ret = dwc3_gadget_run_stop(dwc, true, false);
>  	}
>  
> +done:
>  	pm_runtime_put(dwc->dev);
>  
>  	return ret;
> -- 
> 2.40.0
> 

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

Thanks,
Thinh