| Message ID | b3c45980a230f17af186d4004107ed27ee952cc9.1697547461.git.deren.wu@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | wifi: mt76: mt7921: fix kernel panic by accessing invalid 6GHz channel info | expand |
Il 17/10/23 15:04, Deren Wu ha scritto: > From: Ming Yen Hsieh <mingyen.hsieh@mediatek.com> > > When the chip not support 6GHz capability, the channels of 6GHz information > should not be updated. > > May get the stacktrace without this patch. > <1>[ 19.442078] Unable to handle kernel NULL pointer dereference at > virtual address 0000000000000014 > <1>[ 19.457535] Mem abort info: > <1>[ 19.465329] ESR = 0x0000000096000004 > <1>[ 19.473295] EC = 0x25: DABT (current EL), IL = 32 bits > <1>[ 19.482354] SET = 0, FnV = 0 > <1>[ 19.489143] EA = 0, S1PTW = 0 > <1>[ 19.495991] FSC = 0x04: level 0 translation fault > <1>[ 19.504554] Data abort info: > <1>[ 19.511111] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 > <1>[ 19.520269] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 > <1>[ 19.528988] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 > <1>[ 19.537960] user pgtable: 4k pages, 48-bit VAs, pgdp=00000001027a9000 > <1>[ 19.548014] [0000000000000014] pgd=0000000000000000, p4d=000000000000 > <0>[ 19.558429] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP > <4>[ 19.568270] Modules linked in: mt7921e mt7921_common mt792x_lib > mt76_connac_lib mt76 mac80211 btusb btintel cfg80211 btmtk snd_sof_ipc_msg_ > btrtl snd_sof_ipc_flood_test btbcm bluetooth snd_sof_mt8195 uvcvideo > mtk_adsp_common snd_sof_xtensa_dsp uvc snd_sof_of snd_sof videobuf2_vmalloc > ecdh_generic ecc snd_sof_utils cros_ec_lid_angle cros_ec_sensors crct10dif_ > cros_ec_sensors_core cros_usbpd_logger crypto_user fuse ip_tables ipv6 > <4>[ 19.614237] CPU: 1 PID: 105 Comm: kworker/1:1 Not tainted > 6.6.0-rc6-next-20231017+ #324 > <4>[ 19.625957] Hardware name: Acer Tomato (rev2) board (DT) > <4>[ 19.634970] Workqueue: events mt7921_init_work [mt7921_common] > <4>[ 19.644522] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTY > <4>[ 19.655182] pc : mt7921_regd_notifier+0x180/0x290 [mt7921_common] > <4>[ 19.664983] lr : mt7921_regd_notifier+0xd4/0x290 [mt7921_common] > <4>[ 19.674679] sp : ffff800080acba80 > <4>[ 19.681649] x29: ffff800080acba80 x28: 0000000000000000 x27: ffff4faf > <4>[ 19.692483] x26: 0000000000000000 x25: 0000000000000000 x24: ffff4faf > <4>[ 19.703294] x23: 00000000ffffe926 x22: ffff4faf16031fa0 x21: 00000000 > <4>[ 19.714108] x20: 000000000000001c x19: ffff4faf16ba6f40 x18: 00000000 > <4>[ 19.724928] x17: 0000000000000000 x16: ffffac6b891c2750 x15: ffff8000 > <4>[ 19.735722] x14: 0000000000000180 x13: 0000000000000000 x12: 00000000 > <4>[ 19.746478] x11: 0000000000000002 x10: ffff4faf01c21780 x9 : ffffac6b > <4>[ 19.757214] x8 : 00000000006c0000 x7 : ffffac6b6b020cf0 x6 : ffffac6b > <4>[ 19.767945] x5 : ffffac6b6b020d00 x4 : ffffac6b6b020cf8 x3 : ffff4faf > <4>[ 19.778648] x2 : 0000000000000000 x1 : 000000000000001c x0 : 00000000 > <4>[ 19.789366] Call trace: > <4>[ 19.795381] mt7921_regd_notifier+0x180/0x290 [mt7921_common] > <4>[ 19.804675] wiphy_update_regulatory+0x2bc/0xa08 [cfg80211] > <4>[ 19.813864] wiphy_regulatory_register+0x4c/0x88 [cfg80211] > <4>[ 19.823029] wiphy_register+0x75c/0x8d0 [cfg80211] > <4>[ 19.831446] ieee80211_register_hw+0x70c/0xc10 [mac80211] > <4>[ 19.840479] mt76_register_device+0x168/0x2e8 [mt76] > <4>[ 19.849008] mt7921_init_work+0xdc/0x250 [mt7921_common] > <4>[ 19.857817] process_one_work+0x148/0x3c0 > <4>[ 19.865292] worker_thread+0x32c/0x450 > <4>[ 19.872489] kthread+0x11c/0x128 > <4>[ 19.879173] ret_from_fork+0x10/0x20 > <0>[ 19.886153] Code: f0000041 9100a021 94000aef aa0003f9 (b9401780) > <4>[ 19.895634] ---[ end trace 0000000000000000 ]--- > > Reported-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> > Closes: https://lore.kernel.org/all/927e7d50-826d-4c92-9931-3c59b18c6945@collabora.com/ > Fixes: 09382d8f8641 ("mt7921: update the channel usage when the regd domain changed") > Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com> > Signed-off-by: Deren Wu <deren.wu@mediatek.com> I can confirm the regression is fixed with this patch. # Acer Chromebook Spin 513 CP513-2H (MT8195) Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Thanks, Angelo
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c index 55baac70860b..7d6a9d746011 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c @@ -88,6 +88,9 @@ mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev) } sband = wiphy->bands[NL80211_BAND_6GHZ]; + if (!sband) + return; + band_np = np ? of_get_child_by_name(np, "txpower-6g") : NULL; for (i = 0; i < sband->n_channels; i++) { ch = &sband->channels[i];