Linux-USB Archive on lore.kernel.org
 help / color / Atom feed
From: Greg KH <gregkh@linuxfoundation.org>
To: David Heinzelmann <heinzelmann.david@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>, linux-usb@vger.kernel.org
Subject: Re: [PATCH] Check for changed device descriptors when a connection-change occurs before validating the connection.
Date: Mon, 7 Oct 2019 17:35:38 +0200
Message-ID: <20191007153538.GA985210@kroah.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1910071001230.1513-100000@iolanthe.rowland.org>

On Mon, Oct 07, 2019 at 10:01:47AM -0400, Alan Stern wrote:
> On Mon, 7 Oct 2019, David Heinzelmann wrote:
> 
> > Hi,
> > 
> > I hope it all fits now.
> > 
> > David
> > 
> > 
> > From 8517ecfac0175aebba03bb0868dde652bc3c36e5 Mon Sep 17 00:00:00 2001
> > From: David Heinzelmann <heinzelmann.david@gmail.com>
> > Date: Fri, 4 Oct 2019 12:28:36 +0200
> > Subject: [PATCH v4] usb: hub: Check device descriptor before resusciation
> > 
> > If a device connected to an xHCI host controller disconnects from the USB bus
> > and then reconnects, e.g. triggered by a firmware update, then the host
> > controller automatically activates the connection and the port is enabled. The
> > implementation of hub_port_connect_change() assumes that if the port is
> > enabled then nothing has changed. There is no check if the USB descriptors
> > have changed. As a result, the kernel's internal copy of the descriptors ends
> > up being incorrect and the device doesn't work properly anymore.
> > 
> > The solution to the problem is for hub_port_connect_change() always to
> > check whether the device's descriptors have changed before resuscitating
> > an enabled port.
> > 
> > Signed-off-by: David Heinzelmann <heinzelmann.david@gmail.com>
> 
> Acked-by: Alan Stern <stern@rowland.harvard.edu>

David, can you resend this in a format that I can apply it in?

thanks,

greg k-h

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-20 10:36 David Heinzelmann
2019-09-20  8:55 ` Greg KH
2019-09-20 13:17   ` David Heinzelmann
2019-09-20 12:15     ` Greg KH
2019-09-20 15:33       ` David Heinzelmann
2019-09-23 14:49         ` Alan Stern
2019-09-24 10:01           ` David Heinzelmann
2019-09-25 14:20             ` Alan Stern
2019-09-30  7:26               ` David Heinzelmann
2019-09-30 14:25                 ` Alan Stern
2019-10-04 13:23                   ` David Heinzelmann
2019-10-04 14:17                     ` Alan Stern
2019-10-07  8:47                       ` David Heinzelmann
2019-10-07 14:01                         ` Alan Stern
2019-10-07 15:35                           ` Greg KH [this message]
2019-10-08  8:09                             ` [PATCH v4] usb: hub: Check device descriptor before resusciation David Heinzelmann
2019-10-08 12:55                               ` Greg KH
2019-10-08 16:10                                 ` David Heinzelmann
2019-10-08 15:17                                   ` Greg KH
2019-10-09  4:46                             ` [PATCH v5] " David Heinzelmann

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191007153538.GA985210@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=heinzelmann.david@gmail.com \
    --cc=linux-usb@vger.kernel.org \
    --cc=stern@rowland.harvard.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-USB Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-usb/0 linux-usb/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-usb linux-usb/ https://lore.kernel.org/linux-usb \
		linux-usb@vger.kernel.org
	public-inbox-index linux-usb

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-usb


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git