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Date:   Wed, 9 Feb 2022 17:05:50 +0100
From:   Michael =?UTF-8?B?QsO8c2No?= <m@bues.ch>
To:     Felix Fietkau <nbd@nbd.name>,
        Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Shayne Chen <shayne.chen@mediatek.com>,
        Sean Wang <sean.wang@mediatek.com>
Cc:     linux-wireless@vger.kernel.org
Subject: mt7921: Oops in mt76_dma_rx_fill
Message-ID: <20220209170550.0a73ebe4@barney>
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Hi,

on the latest stable 5.16.8 (df659ebe) the Mediatek WLAN driver crashes
on my machine in a DMA function.

Please excuse me for the crappy photos. The first one has been captured
out of a video. Therefore it's partially interleaved with the
predecessor frame.

https://bues.ch/misc/mt7921/mt7921_oops1.jpg
https://bues.ch/misc/mt7921/mt7921_oops2.jpg

Most of the time the crash happens right during system boot.

The stable kernel 5.15.y does not crash. (However, I frequently get
connection interruptions. But I'm not sure whether that's related to
the driver.)

03:00.0 Network controller: MEDIATEK Corp. MT7921 802.11ax PCI Express Wireless Network Adapter

03:00.0 0280: 14c3:7961
        Subsystem: 17aa:e0bc
        Physical Slot: 0
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 94
        IOMMU group: 11
        Region 0: Memory at 670200000 (64-bit, prefetchable) [size=1M]
        Region 2: Memory at 670300000 (64-bit, prefetchable) [size=16K]
        Region 4: Memory at 670304000 (64-bit, prefetchable) [size=4K]
        Capabilities: <access denied>
        Kernel driver in use: mt7921e
        Kernel modules: mt7921e


-- 
Michael Büsch
https://bues.ch/