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

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Date:   Wed, 16 May 2018 15:29:20 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Hayes Wang <hayeswang@...ltek.com>,
        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

On 05/16/2018, 02:07 PM, Hayes Wang wrote:
> Oliver Neukum [mailto:oneukum@...e.com]
>> Sent: Wednesday, May 16, 2018 6:10 PM
> [...]
>>> Besides, I find a similar issue as following.
>>> https://www.spinics.net/lists/netdev/msg493512.html
>>
>> Well, if we have an imbalance in NAPI it should strike whereever
>> it is used, not just in suspend(). Is there debugging for NAPI
>> we could activate?
> 
> No. The driver doesn't embed such debugging about it.

Despite of that, Oliver, I have a kernel with a debug patch (attached)
at (suse-only link):
https://build.suse.de/project/show/home:jirislaby:stable-drm

> And I don't find an imbalance between napi_disable() and napi_enable().

There is none, apparently (the warns never triggered). BUt still the
driver sucks wrt both power mgmt and dock plug/unplug. Since I am using
the patch (it upper-bounds the napi_disable loop count) and the udev
rule below, I can really use the nic.

$ cat /etc/udev/rules.d/10-disable-r8152-pm.rules
ACTION=="add", SUBSYSTEM=="usb", ATTR{idProduct}=="8153",
ATTR{idVendor}=="0bda", TEST=="power/control", ATTR{power/control}="on"

thanks,
-- 
js
suse labs

View attachment "r8152.patch" of type "text/x-patch" (5468 bytes)