linux-kernel - Re: [PATCH v2] USB: usbip: fix stub

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Date:   Thu, 5 Oct 2023 09:22:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jonas Blixt <jonas.blixt@...ia.se>
Cc:     shuah@...nel.org, valentina.manea.m@...il.com,
        stern@...land.harvard.edu, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] USB: usbip: fix stub_dev hub disconnect

On Thu, Jun 15, 2023 at 11:28:10AM +0200, Jonas Blixt wrote:
> If a hub is disconnected that has device(s) that's attached to the usbip layer
> the disconnect function might fail because it tries to release the port
> on an already disconnected hub.
> 
> Fixes: 6080cd0e9239 ("staging: usbip: claim ports used by shared devices")
> Signed-off-by: Jonas Blixt <jonas.blixt@...ia.se>
> ---
> v2:
>  - Clarify comment
> v1:
>  Link to v1: https://lore.kernel.org/linux-usb/20230615092205.GA1212960@W388ANL/T/#m575e37dc404067797eadf4444857366c73ba3420
> ---
>  drivers/usb/usbip/stub_dev.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
> index 2305d425e6c9..2170c95c8dab 100644
> --- a/drivers/usb/usbip/stub_dev.c
> +++ b/drivers/usb/usbip/stub_dev.c
> @@ -427,8 +427,13 @@ static void stub_disconnect(struct usb_device *udev)
>  	/* release port */
>  	rc = usb_hub_release_port(udev->parent, udev->portnum,
>  				  (struct usb_dev_state *) udev);
> -	if (rc) {
> -		dev_dbg(&udev->dev, "unable to release port\n");
> +	/*
> +	 * NOTE: If a HUB disconnect triggered disconnect of the down stream
> +	 * device usb_hub_release_port will return -ENODEV so we can safely ignore
> +	 * that error here.
> +	 */
> +	if (rc && (rc != -ENODEV)) {
> +		dev_dbg(&udev->dev, "unable to release port (%i)\n", rc);
>  		return;
>  	}
>  
> -- 
> 2.25.1
> 

Shuah, what ever happened to this change, is it correct or was something
else applied to fix it?

thanks,

greg k-h