[PATCH] wifi: mt76: fix oops on non-dbdc mt7986

[Bjørn Mork]

Kalle Valo <kvalo at kernel.org> writes:
> Bjørn Mork <bjorn at mork.no> writes:
>
>> mt7915_band_config() sets band_idx = 1 on the main phy for mt7986
>> with MT7975_ONE_ADIE or MT7976_ONE_ADIE.
>>
>> Commit 0335c034e726 ("wifi: mt76: fix race condition related to
>> checking tx queue fill status") introduced a dereference of the
>> phys array indirectly indexed by band_idx via wcid->phy_idx in
>> mt76_wcid_cleanup(). This caused the following Oops on affected
>> mt7986 devices:
>>
>>  Unable to handle kernel read from unreadable memory at virtual address 0000000000000024
>>  Mem abort info:
>>    ESR = 0x0000000096000005
>>    EC = 0x25: DABT (current EL), IL = 32 bits
>>    SET = 0, FnV = 0
>>    EA = 0, S1PTW = 0
>>    FSC = 0x05: level 1 translation fault
>>  Data abort info:
>>    ISV = 0, ISS = 0x00000005
>>    CM = 0, WnR = 0
>>  user pgtable: 4k pages, 39-bit VAs, pgdp=0000000042545000
>>  [0000000000000024] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
>>  Internal error: Oops: 0000000096000005 [#1] SMP
>>  Modules linked in: ... mt7915e mt76_connac_lib mt76 mac80211 cfg80211 ...
>>  CPU: 2 PID: 1631 Comm: hostapd Not tainted 5.15.150 #0
>>  Hardware name: ZyXEL EX5700 (Telenor) (DT)
>>  pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>>  pc : mt76_wcid_cleanup+0x84/0x22c [mt76]
>>  lr : mt76_wcid_cleanup+0x64/0x22c [mt76]
>>  sp : ffffffc00a803700
>>  x29: ffffffc00a803700 x28: ffffff80008f7300 x27: ffffff80003f3c00
>>  x26: ffffff80000a7880 x25: ffffffc008c26e00 x24: 0000000000000001
>>  x23: ffffffc000a68114 x22: 0000000000000000 x21: ffffff8004172cc8
>>  x20: ffffffc00a803748 x19: ffffff8004152020 x18: 0000000000000000
>>  x17: 00000000000017c0 x16: ffffffc008ef5000 x15: 0000000000000be0
>>  x14: ffffff8004172e28 x13: ffffff8004172e28 x12: 0000000000000000
>>  x11: 0000000000000000 x10: ffffff8004172e30 x9 : ffffff8004172e28
>>  x8 : 0000000000000000 x7 : ffffff8004156020 x6 : 0000000000000000
>>  x5 : 0000000000000031 x4 : 0000000000000000 x3 : 0000000000000001
>>  x2 : 0000000000000000 x1 : ffffff80008f7300 x0 : 0000000000000024
>>  Call trace:
>>   mt76_wcid_cleanup+0x84/0x22c [mt76]
>>   __mt76_sta_remove+0x70/0xbc [mt76]
>>   mt76_sta_state+0x8c/0x1a4 [mt76]
>>   mt7915_eeprom_get_power_delta+0x11e4/0x23a0 [mt7915e]
>>   drv_sta_state+0x144/0x274 [mac80211]
>>   sta_info_move_state+0x1cc/0x2a4 [mac80211]
>>   sta_set_sinfo+0xaf8/0xc24 [mac80211]
>>   sta_info_destroy_addr_bss+0x4c/0x6c [mac80211]
>>
>>   ieee80211_color_change_finish+0x1c08/0x1e70 [mac80211]
>>   cfg80211_check_station_change+0x1360/0x4710 [cfg80211]
>>   genl_family_rcv_msg_doit+0xb4/0x110
>>   genl_rcv_msg+0xd0/0x1bc
>>   netlink_rcv_skb+0x58/0x120
>>   genl_rcv+0x34/0x50
>>   netlink_unicast+0x1f0/0x2ec
>>   netlink_sendmsg+0x198/0x3d0
>>   ____sys_sendmsg+0x1b0/0x210
>>   ___sys_sendmsg+0x80/0xf0
>>   __sys_sendmsg+0x44/0xa0
>>   __arm64_sys_sendmsg+0x20/0x30
>>   invoke_syscall.constprop.0+0x4c/0xe0
>>   do_el0_svc+0x40/0xd0
>>   el0_svc+0x14/0x4c
>>   el0t_64_sync_handler+0x100/0x110
>>   el0t_64_sync+0x15c/0x160
>>  Code: d2800002 910092c0 52800023 f9800011 (885f7c01)
>>  ---[ end trace 7e42dd9a39ed2281 ]---
>>
>> Fix by using mt76_dev_phy() which will map band_idx to the correct phy
>> for all hardware combinations.
>>
>> Fixes: 0335c034e726 ("wifi: mt76: fix race condition related to checking tx queue fill status")
>> Link: https://github.com/openwrt/openwrt/issues/14548
>> Signed-off-by: Bjørn Mork <bjorn at mork.no>
>
> Should this go to wireless tree?

I believe it should. If fixes a regression on the affected hardware,
introduced by commit 0335c034e726.

It should also go into any still maintained v6.7, v6.8, v6.9, v6.10
stable trees.  But I assume they will pick it up automatically based on
the Fixes tag.



Bjørn