linux-kernel - Re: [PATCH] usb: renesas-xhci: Fix handling of unknown ROM state

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Date:   Tue, 15 Jun 2021 09:15:01 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     maz@...nel.org, vkoul@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>
Subject: Re: [PATCH] usb: renesas-xhci: Fix handling of unknown ROM state

On Mon, Jun 14, 2021 at 07:25:14PM -0700, Moritz Fischer wrote:
> If the ROM status returned is unknown (RENESAS_ROM_STATUS_NO_RESULT)
> we need to attempt loading the firmware rather than just skipping
> it all together.

How can this happen?  Can you provide more information here?

> 
> Cc: stable@...r.kernel.org
> Cc: Mathias Nyman <mathias.nyman@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Fixes: 2478be82de44 ("usb: renesas-xhci: Add ROM loader for uPD720201")
> Signed-off-by: Moritz Fischer <mdf@...nel.org>
> ---
>  drivers/usb/host/xhci-pci-renesas.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-pci-renesas.c b/drivers/usb/host/xhci-pci-renesas.c
> index f97ac9f52bf4..dfe54f0afc4b 100644
> --- a/drivers/usb/host/xhci-pci-renesas.c
> +++ b/drivers/usb/host/xhci-pci-renesas.c
> @@ -207,7 +207,8 @@ static int renesas_check_rom_state(struct pci_dev *pdev)
>  			return 0;
>  
>  		case RENESAS_ROM_STATUS_NO_RESULT: /* No result yet */
> -			return 0;
> +			dev_dbg(&pdev->dev, "Unknown ROM status ...\n");
> +			break;
>  
>  		case RENESAS_ROM_STATUS_ERROR: /* Error State */
>  		default: /* All other states are marked as "Reserved states" */
> @@ -224,13 +225,11 @@ static int renesas_fw_check_running(struct pci_dev *pdev)
>  	u8 fw_state;
>  	int err;
>  
> -	/* Check if device has ROM and loaded, if so skip everything */
> -	err = renesas_check_rom(pdev);
> -	if (err) { /* we have rom */
> -		err = renesas_check_rom_state(pdev);
> -		if (!err)
> -			return err;
> -	}
> +	/* Only if device has ROM and loaded FW we can skip loading and
> +	 * return success. Otherwise (even unknown state), attempt to load FW.
> +	 */

Nit, but please use the correct comment style format, like is used a few
lines below:

> +	if (renesas_check_rom(pdev) && !renesas_check_rom_state(pdev))
> +		return 0;
>  
>  	/*
>  	 * Test if the device is actually needing the firmware. As most

This isn't the networking tree :)

thanks,

greg k-h