Re: [REGRESSION] MT7915E doesn't work any more with v6.9

From: Oleksandr Natalenko
Date: Tue May 14 2024 - 18:52:03 EST


Also /cc Johannes because of this commit:

6092077ad09ce wifi: mac80211: introduce 'channel request'

On středa 15. května 2024 0:43:40, SELČ Oleksandr Natalenko wrote:
> 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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