linux-kernel - Re: [PATCH 2/2] asix: fix wrong return value in asix_check_host

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Message-ID: <YcIulPIwii+7OOzT@lunn.ch>
Date:   Tue, 21 Dec 2021 20:44:20 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, linux@...pel-privat.de,
        robert.foss@...labora.com, freddy@...x.com.tw,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] asix: fix wrong return value in
 asix_check_host_enable()

On Tue, Dec 21, 2021 at 10:40:05PM +0300, Pavel Skripkin wrote:
> If asix_read_cmd() returns 0 on 30th interation, 0 will be returned from
> asix_check_host_enable(), which is logically wrong. Fix it by returning
> -ETIMEDOUT explicitly if we have exceeded 30 iterations
> 
> Fixes: a786e3195d6a ("net: asix: fix uninit value bugs")
> Reported-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> ---
>  drivers/net/usb/asix_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
> index 06823d7141b6..8c61d410a123 100644
> --- a/drivers/net/usb/asix_common.c
> +++ b/drivers/net/usb/asix_common.c
> @@ -83,7 +83,7 @@ static int asix_check_host_enable(struct usbnet *dev, int in_pm)
>  			break;
>  	}
>  
> -	return ret;
> +	return i >= 30? -ETIMEDOUT: ret;

I think the coding style guidelines would recommend a space before the ?

I would also replace the 30 with a #define, both here and in the for
loop.

	Andrew