linux-kernel - Re: [REGRESSION] bluetooth: mt7921: Crash on Resume From Suspend And Hibernate

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Message-ID: <20241206022919.183292-1-jglotzer@gmail.com>
Date: Thu,  5 Dec 2024 18:29:19 -0800
From: John Glotzer <jglotzer@...il.com>
To: sergio.callegari@...il.com
Cc: Aaron.Hou@...iatek.com,
	Chris.Lu@...iatek.com,
	Deren.Wu@...iatek.com,
	Hao.Qin@...iatek.com,
	Sean.Wang@...iatek.com,
	jglotzer@...il.com,
	johan.hedberg@...il.com,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	luiz.dentz@...il.com,
	marc.payne@...sys.co.uk,
	marcel@...tmann.org,
	regressions@...mhuis.info,
	regressions@...ts.linux.dev,
	steve.lee@...iatek.com,
	tiwai@...e.de
Subject: Re: [REGRESSION] bluetooth: mt7921: Crash on Resume From Suspend And Hibernate

Sergio,

My apologies, I neglected to mention that my setup is PCI, and not USB.

It's an AMD Ryzen 5 7600 CPU on a PRO B650M-A Wifi motherboard. For completeness OS is Fedora 40
with any kernel starting with 6.11.x.

    $ lspci | grep MEDIATEK
    0c:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter

    $lshw -C Network
       ...
      *-network
           description: Wireless interface
           product: MT7922 802.11ax PCI Express Wireless Network Adapter
           vendor: MEDIATEK Corp.
           physical id: 0
           bus info: pci@...0:0c:00.0
           logical name: wlp12s0
           version: 00
           serial: 0e:80:32:35:2c:9b
           width: 64 bits
           clock: 33MHz
           capabilities: bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=mt7921e driverversion=6.11.10-200.fc40.x86_64 firmware=____000000-20240716163327
           ip=192.168.139.211 latency=0 link=yes multicast=yes wireless=IEEE 802.11
           resources: iomemory:fc0-fbf irq:103 memory:fcf0300000-fcf03fffff memory:f6c00000-f6c07fff

What I am struggling to understand is given how easy this issue is to reproduce -  an AMD CPU, Mediatek MT7922 wifi/bluetooth chip,
and a 6.11 kernel, you suspend, and then wake up, kernel panics -  I would have thought that the interested parties would
make this a priority.

I think that a logical first step would be for SW owners to confirm (or deny) the anomalous behavior.

Thanks,

John