netdev - RE: Hangs in r8152 connected to power management in kernels at least up v4.17-rc4

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2D2E47EB4@RTITMBSV06.realtek.com.tw>
Date:   Wed, 16 May 2018 10:00:09 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Oliver Neukum <oneukum@...e.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Hangs in r8152 connected to power management in kernels at least up v4.17-rc4

Oliver Neukum [mailto:oneukum@...e.com]
> Sent: Wednesday, May 16, 2018 4:27 PM
[...]
> >
> > Would usb_autopm_get_interface() take a long time?
> > The driver would wake the device if it has suspended.
> > I have no idea about how usb_autopm_get_interface() works, so I don't know
> how to help.
> 
> Hi,
> 
> it basically calls r8152_resume() and makes a control request to the
> hub. I think we are spinning in rtl8152_runtime_resume(), but where?
> It has a lot of NAPI stuff. Any suggestions on how to instrument or
> trace this?

Is rtl8152_runtime_resume() called? I don't see the name in the trace.

I guess the relative API in rtl8152_runtime_resume() are
		ops->disable		= rtl8153_disable;
		ops->autosuspend_en	= rtl8153_runtime_enable;

And I don't find any possible dead lock in rtl8152_runtime_resume().

Besides, I find a similar issue as following.
https://www.spinics.net/lists/netdev/msg493512.html


Best Regards,
Hayes