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From: Kalle Valo <kvalo@kernel.org>
To: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: linux-kernel@vger.kernel.org,  linux-wireless@vger.kernel.org,  "Linux
 regression tracking (Thorsten Leemhuis)" <regressions@leemhuis.info>,
  linux-mediatek@lists.infradead.org,
  linux-arm-kernel@lists.infradead.org,  Felix Fietkau <nbd@nbd.name>,
  Lorenzo Bianconi <lorenzo@kernel.org>,  Ryder Lee
 <ryder.lee@mediatek.com>,  Shayne Chen <shayne.chen@mediatek.com>,  Sean
 Wang <sean.wang@mediatek.com>,  Matthias Brugger <matthias.bgg@gmail.com>,
  AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
  Peter Chiu <chui-hao.chiu@mediatek.com>,  StanleyYP Wang
 <StanleyYP.Wang@mediatek.com>,  Linux regressions mailing list
 <regressions@lists.linux.dev>
Subject: Re: [REGRESSION] MT7915E doesn't work any more with v6.9
References: <6061263.lOV4Wx5bFT@natalenko.name>
Date: Wed, 15 May 2024 08:18:16 +0300
In-Reply-To: <6061263.lOV4Wx5bFT@natalenko.name> (Oleksandr Natalenko's
	message of "Wed, 15 May 2024 00:43:40 +0200")
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Oleksandr Natalenko <oleksandr@natalenko.name> writes:

> Hello Felix, Lorenzo et al.
>
> With v6.9 kernel the following card:
>
> 01:00.0 Unclassified device [0002]: MEDIATEK Corp. MT7915E 802.11ax
> PCI Express Wireless Network Adapter [14c3:7915]
>
> doesn't work any more. Upon mt7915e module insertion the following splat happens:
>
> mt7915e 0000:01:00.0: enabling device (0000 -> 0002)
> WARNING: CPU: 3 PID: 1648 at net/mac80211/main.c:794
> ieee80211_alloc_hw_nm+0x9a3/0x9f0 [mac80211]
> Call Trace:
>  <TASK>
>  mt76_alloc_device+0x24/0x290 [mt76 46e2c4f11be089903469a4d6045c71cb7842b4cd]
>  mt7915_mmio_probe+0x33/0x1d0 [mt7915e 9657e1926e619568545a08636674805d5e665c85]
>  mt7915_pci_probe+0xe1/0x3a0 [mt7915e 9657e1926e619568545a08636674805d5e665c85]
>  pci_device_probe+0xf0/0x2d0
>  really_probe+0xde/0x3b0
>  __driver_probe_device+0x78/0x110
>  driver_probe_device+0x1f/0x130
>  __driver_attach+0x91/0x1e0
>  bus_for_each_dev+0x105/0x160
>  bus_add_driver+0x137/0x270
>  driver_register+0x72/0xd0
>  mt7915_init+0x44/0xff0 [mt7915e 9657e1926e619568545a08636674805d5e665c85]
>  do_one_initcall+0x5b/0x310
>  do_init_module+0x60/0x220
>  init_module_from_file+0x89/0xe0
>  idempotent_init_module+0x121/0x2b0
>  __x64_sys_finit_module+0x5e/0xb0
>  do_syscall_64+0x82/0x160
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> mt7915e 0000:01:00.0: probe with driver mt7915e failed with error -12
>
> and the card stays non-functional. Re-inserting the module triggers
> the same behaviour.
>
> The following condition is triggered:
>
>  794                 if (WARN_ON(!ops->add_chanctx ||
>  795                             !ops->remove_chanctx ||
>  796                             !ops->change_chanctx ||
>  797                             !ops->assign_vif_chanctx ||
>  798                             !ops->unassign_vif_chanctx))
>  799                         return NULL;
>
> This worked with v6.8 and earlier just fine.

Thanks for the report. I'll add this to regzbot for easier tracking:

#regzbot introduced: v6.8..v6.9 ^

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