linux-kernel - [REGRESSION] MT7915E doesn't work any more with v6.9

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Date: Wed, 15 May 2024 00:43:40 +0200
From: Oleksandr Natalenko <oleksandr@...alenko.name>
To: linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
 "Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info>
Cc: linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 Felix Fietkau <nbd@....name>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Ryder Lee <ryder.lee@...iatek.com>, Shayne Chen <shayne.chen@...iatek.com>,
 Sean Wang <sean.wang@...iatek.com>, Kalle Valo <kvalo@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Peter Chiu <chui-hao.chiu@...iatek.com>,
 StanleyYP Wang <StanleyYP.Wang@...iatek.com>,
 Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: [REGRESSION] MT7915E doesn't work any more with v6.9

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.

Please help.

Thank you.

-- 
Oleksandr Natalenko (post-factum)
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