linux-kernel - RE: [PATCH] usb: hub: move resume delay at the head of all USB access functions

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Date:   Thu, 26 Dec 2019 04:13:58 +0000
From:   "Pan, Harry" <harry.pan@...el.com>
To:     AceLan Kao <acelan.kao@...onical.com>,
        Alan Stern <stern@...land.harvard.edu>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        David Heinzelmann <heinzelmann.david@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Mathieu Malaterre <malat@...ian.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: hub: move resume delay at the head of all USB
 access functions

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@...onical.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@...r.kernel.org; Linux-Kernel@...r. 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/