linux-kernel - Re: [PATCH v2 5/5] r8152: Block future register access if register access fails

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Message-ID: <ZR6pZ5R14xHkW3zT@kernel.org>
Date:   Thu, 5 Oct 2023 14:17:43 +0200
From:   Simon Horman <horms@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Hayes Wang <hayeswang@...ltek.com>,
        "David S . Miller" <davem@...emloft.net>,
        linux-usb@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>,
        Grant Grundler <grundler@...omium.org>,
        Edward Hill <ecgh@...omium.org>,
        Bjørn Mork <bjorn@...k.no>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 5/5] r8152: Block future register access if register
 access fails

On Wed, Oct 04, 2023 at 12:24:42PM -0700, Douglas Anderson wrote:

...

> @@ -9784,7 +9904,29 @@ static int rtl8152_probe(struct usb_interface *intf,
>  	else
>  		device_set_wakeup_enable(&udev->dev, false);
>  
> -	netif_info(tp, probe, netdev, "%s\n", DRIVER_VERSION);
> +	mutex_lock(&tp->control);
> +	if (test_bit(RTL8152_INACCESSIBLE, &tp->flags)) {
> +		/* If the device is marked inaccessible before probe even
> +		 * finished then one of two things happened. Either we got a
> +		 * USB error during probe or the user already unplugged the
> +		 * device.
> +		 *
> +		 * If we got a USB error during probe then we skipped doing a
> +		 * reset in r8152_control_msg() and deferred it to here. This
> +		 * is because the queued reset will give up after 1 second
> +		 * (see usb_lock_device_for_reset()) and we want to make sure
> +		 * that we queue things up right before probe finishes.
> +		 *
> +		 * If the user already unplugged the device then the USB
> +		 * farmework will call unbind right away for us. The extra

Hi Douglas,

As you are planning to re-spin anyway: farmework -> framework

> +		 * reset we queue up here will be harmless.
> +		 */
> +		usb_queue_reset_device(tp->intf);
> +	} else {
> +		set_bit(PROBED_WITH_NO_ERRORS, &tp->flags);
> +		netif_info(tp, probe, netdev, "%s\n", DRIVER_VERSION);
> +	}
> +	mutex_unlock(&tp->control);
>  
>  	return 0;
>  
> -- 
> 2.42.0.582.g8ccd20d70d-goog
>