netdev - Re: [PATCH 2/3] net: usb: r8152: Set probe mode to sync

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Date:   Wed, 5 Jan 2022 16:33:46 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Aaron Ma <aaron.ma@...onical.com>
Cc:     kuba@...nel.org, henning.schild@...mens.com,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        hayeswang@...ltek.com, tiwai@...e.de
Subject: Re: [PATCH 2/3] net: usb: r8152: Set probe mode to sync

On Wed, Jan 05, 2022 at 11:14:26PM +0800, Aaron Ma wrote:
> To avoid the race of get passthrough MAC,
> set probe mode to sync to check the used MAC address.
> 
> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
> ---
>  drivers/net/usb/r8152.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 2483dc421dff..7cf2faf8d088 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -29,6 +29,8 @@
>  #include <crypto/hash.h>
>  #include <linux/usb/r8152.h>
>  
> +static struct usb_driver rtl8152_driver;
> +
>  /* Information for net-next */
>  #define NETNEXT_VERSION		"12"
>  
> @@ -9546,6 +9548,9 @@ static int rtl8152_probe(struct usb_interface *intf,
>  	struct r8152 *tp;
>  	struct net_device *netdev;
>  	int ret;
> +	struct device_driver *rtl8152_drv = &rtl8152_driver.drvwrap.driver;
> +
> +	rtl8152_drv->probe_type = PROBE_FORCE_SYNCHRONOUS;

If you really need to set this type of thing then set BEFORE you
register the driver.  After-the-fact like this is way too late, sorry.
You are already in the probe function which is after the driver core
checked this flag :(

How did you test this?

thanks,

greg k-h