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From: Greg KH <gregkh@linuxfoundation.org>
To: Johan Hovold <johan@kernel.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Steve Markgraf <steve@steve-m.de>
Cc: linux-usb@vger.kernel.org, johan@kernel.org
Subject: Re: Regression in 5.5.0-rc6 for FL2000 USB 3.0 to VGA adapter
Date: Sun, 19 Jan 2020 13:58:23 +0100	[thread overview]
Message-ID: <20200119125823.GC149506@kroah.com> (raw)
In-Reply-To: <9cadc6b9-16f7-e072-abee-53ac5c143198@steve-m.de>

On Sun, Jan 19, 2020 at 12:52:40AM +0100, Steve Markgraf wrote:
> Hi list,
> 
> Commit 3e4f8e21c4f27bcf30a48486b9dcc269512b79ff "USB: core: fix check
> for duplicate endpoints" is causing a regression with devices based on
> the Fresco Logic FL2000 chip, i.e. it is totally unusable.
> 
> The issue was first reported on the osmocom-sdr mailing list [1] and I
> can reproduce it on my machine with 5.5.0-rc6, with rc5 everything is
> working fine. By reverting the commit mentioned above, it is working as
> well.
> 
> When connecting the device with rc6, I see the following dmesg output:
> https://steve-m.de/files/fl2000_dmesg.txt
> 
> The output of lsusb -v:
> https://steve-m.de/files/fl2000_lsusb.txt
> 
> Output of the Windows tool "USB Device Tree Viewer":
> https://steve-m.de/files/fl2000_usbtreeview.txt
> 
> Output of the USB-IF USB 3.0 Chapter 9 tests with a version from around
> the time the FL2000 was released to market (passing):
> https://steve-m.de/files/fl2000_chapter9.html
> 
> By looking at the lsusb output, it almost seems like a descriptor
> parsing issue, that now causes trouble after introducing the duplicate
> endpoint testing.
> 
> Regards,
> Steve
> 
> [1] https://lists.osmocom.org/pipermail/osmocom-sdr/2020-January/002025.html

Odd, this should have been fixed with commit 3e4f8e21c4f2 ("USB: core:
fix check for duplicate endpoints") which is in 5.5-rc6.

Alan and Johan, any ideas?

thanks,

greg k-h

  reply	other threads:[~2020-01-19 12:58 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-18 23:52 Regression in 5.5.0-rc6 for FL2000 USB 3.0 to VGA adapter Steve Markgraf
2020-01-19 12:58 ` Greg KH [this message]
2020-01-19 12:59   ` Greg KH
2020-01-19 13:58 ` Johan Hovold
2020-01-19 14:48   ` Steve Markgraf
2020-01-19 15:15     ` Johan Hovold

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