linux-kernel - Re: [PATCH -next] usb: early: Fix an error code in xdbc

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Message-ID: <YcF2LCEHcr1PsPaO@kroah.com>
Date:   Tue, 21 Dec 2021 07:37:32 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH -next] usb: early: Fix an error code in xdbc_init()

On Tue, Dec 21, 2021 at 10:20:36AM +0800, Yang Li wrote:
> When xdbc_trace("hardware not used anymore\n") is performed,
> ret should be assigned -ENODEV to indicate this.
> 
> Clean up smatch warning:
> drivers/usb/early/xhci-dbc.c:972 xdbc_init() warn: missing error code
> 'ret'
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  drivers/usb/early/xhci-dbc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/early/xhci-dbc.c b/drivers/usb/early/xhci-dbc.c
> index 4502108069cd..fcb05a8948fa 100644
> --- a/drivers/usb/early/xhci-dbc.c
> +++ b/drivers/usb/early/xhci-dbc.c
> @@ -969,6 +969,7 @@ static int __init xdbc_init(void)
>  	if (early_xdbc_console.index == -1 ||
>  	    (early_xdbc_console.flags & CON_BOOT)) {
>  		xdbc_trace("hardware not used anymore\n");
> +		ret = -ENODEV;
>  		goto free_and_quit;
>  	}

How did you test this?

I think you just broke this, the function should be returning 0 here,
like it currently is.  Are you SURE smatch is correct?

I'll only accept this if you can prove it is tested.  Do you have this
hardware?

thanks,

greg k-h