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

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Date:   Tue, 13 Jun 2023 11:50:31 +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] USB: usbip: fix stub_dev hub disconnect

On Tue, Jun 13, 2023 at 11:29:18AM +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>
> ---
>  drivers/usb/usbip/stub_dev.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
> index 2305d425e6c9..257861787cdf 100644
> --- a/drivers/usb/usbip/stub_dev.c
> +++ b/drivers/usb/usbip/stub_dev.c
> @@ -427,8 +427,12 @@ 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.

How about adding, "so we can safely ignore that error here."

thanks,

greg k-h