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From:   "Pan, Harry" <harry.pan@intel.com>
To:     AceLan Kao <acelan.kao@canonical.com>,
        Alan Stern <stern@rowland.harvard.edu>
CC:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Kai-Heng Feng <kai.heng.feng@canonical.com>,
        Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        David Heinzelmann <heinzelmann.david@gmail.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Mathieu Malaterre <malat@debian.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] usb: hub: move resume delay at the head of all USB
 access functions
Thread-Topic: [PATCH] usb: hub: move resume delay at the head of all USB
 access functions
Thread-Index: AQHVtuF8vF42Fbh98kKiQOV38Geg2KfCpgQAgAP5R4CAAkjxAIAAxuoAgAIoH9Q=
Date:   Thu, 26 Dec 2019 04:13:58 +0000
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Hi AceLan,

Would you mind to read this thread and evaluate whether it is helpful or not by kernel downgrade?
https://bugzilla.kernel.org/show_bug.cgi?id=202541

BTW, would you mind to the shared pcap file permission as well? 

-Harry
________________________________________
從: AceLan Kao [acelan.kao@canonical.com]
寄件日期: 2019年12月25日 上午 11:15
至: Alan Stern
副本: Greg Kroah-Hartman; Kai-Heng Feng; Thinh Nguyen; Pan, Harry; David Heinzelmann; Andrey Konovalov; Nicolas Saenz Julienne; Mathieu Malaterre; linux-usb@vger.kernel.org; Linux-Kernel@Vger. Kernel. Org
主旨: Re: [PATCH] usb: hub: move resume delay at the head of all USB access functions

Here[1] are the dmesg and the usbmon log from wireshark, and
/sys/kernel/debug/usb/usbmon/0u.

I verified this issue on Dell XPS 13 + Dell Salomon WD19 docking
station(plug-in 3 USB disk on it)
After s2idle 7 times, 2 usb disks lost. But from wireshark log, the
packets look normal, no error.

So, I re-do the test again and log the usbmon/0u output, but it's greek to me.
Hope you can help to find some clues in the logs.
Thanks.

1. https://people.canonical.com/~acelan/bugs/usb_issue/