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Message-ID: <f264888e-6100-4812-9661-ffad174f45af@windestam.se>
Date: Wed, 5 Feb 2025 20:29:26 +0100
From: Pelle Windestam <pelle@...destam.se>
To: 胡连勤 <hulianqin@...o.com>,
 "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
 Dan Carpenter <dan.carpenter@...aro.org>, Jon Hunter <jonathanh@...dia.com>
Cc: Prashanth K <quic_prashk@...cinc.com>,
 "mwalle@...nel.org" <mwalle@...nel.org>,
 "quic_jjohnson@...cinc.com" <quic_jjohnson@...cinc.com>,
 David Brownell <dbrownell@...rs.sourceforge.net>,
 "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "opensource.kernel" <opensource.kernel@...o.com>,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
 Brad Griffis <bgriffis@...dia.com>,
 Harshit Mogalapalli <harshit.m.mogalapalli@...il.com>
Subject: Re: 答复: [PATCH v3] usb: gadget: u_serial: Disable ep before setting port to null to fix the crash caused by port being null

>>>>> Odd, you have a usb-serial gadget device in this system that is
>>>>> disconnecting somehow?  That oops doesn't point to anything in the
>>>>> usb gadget codebase, "all" we have done is move the call to
>>>>> shutdown the endpoints to earlier in the disconnect function.
>>>>
>>>> Yes the board starts usb-serial and usb-ethernet gadget and on
>>>> reboot when tearing it down I am seeing the above. As soon as it
>>>> disables the tegra-xudc endpoints (as seen above) the board appears to
>> stall.
>>>>
>>>>> I'm glad to revert this, but it feels really odd that this is
>>>>> causing you an rcu stall issue.
>>>>
>>>> Thanks. I can't say I understand it either, but I am certain it is
>>>> caused by this change.
>>>>

I do not have much to add in terms of solutions but want to chime in 
that the same issue happened to me the other day when I upgraded my 
kernel. It manifests itself with the rcu stall whenever I try to reboot 
my device with the USB-cable connected (it is a usb-serial gadget 
device). Moving the usb_ep_disable() calls to outside the lock (where 
they were before the patch) solves it.

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