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

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Message-ID: <20230615092205.GA1212960@W388ANL>
Date:   Thu, 15 Jun 2023 11:22:05 +0200
From:   Jonas Blixt <jonas.blixt@...ia.se>
To:     Greg KH <gregkh@...uxfoundation.org>
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 11:50:31AM +0200, Greg KH wrote:
> 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

Yes, I'll update the comment and prepare a V2 patch.

Jonas