Linus Lüssing <linus.luessing@xxxxxxxxx> wrote:
> When trying to set the noise floor via debugfs, a "data bus error"
> crash like the following can happen:
>
> [ 88.433133] Data bus error, epc == 80221c28, ra == 83314e60
> [ 88.438895] Oops[#1]:
> [ 88.441246] CPU: 0 PID: 7263 Comm: sh Not tainted 4.14.195 #0
> [ 88.447174] task: 838a1c20 task.stack: 82d5e000
> [ 88.451847] $ 0 : 00000000 00000030 deadc0de 83141de4
> [ 88.457248] $ 4 : b810a2c4 0000a2c4 83230fd4 00000000
> [ 88.462652] $ 8 : 0000000a 00000000 00000001 00000000
> [ 88.468055] $12 : 7f8ef318 00000000 00000000 77f802a0
> [ 88.473457] $16 : 83230080 00000002 0000001b 83230080
> [ 88.478861] $20 : 83a1c3f8 00841000 77f7adb0 ffffff92
> [ 88.484263] $24 : 00000fa4 77edd860
> [ 88.489665] $28 : 82d5e000 82d5fda8 00000000 83314e60
> [ 88.495070] Hi : 00000000
> [ 88.498044] Lo : 00000000
> [ 88.501040] epc : 80221c28 ioread32+0x8/0x10
> [ 88.505671] ra : 83314e60 ath9k_hw_loadnf+0x88/0x520 [ath9k_hw]
> [ 88.512049] Status: 1000fc03 KERNEL EXL IE
> [ 88.516369] Cause : 5080801c (ExcCode 07)
> [ 88.520508] PrId : 00019374 (MIPS 24Kc)
> [ 88.524556] Modules linked in: ath9k ath9k_common pppoe ppp_async l2tp_ppp cdc_mbim batman_adv ath9k_hw ath sr9700 smsc95xx sierra_net rndis_host qmi_wwan pppox ppp_generic pl2303 nf_conntrack_ipv6 mcs7830 mac80211 kalmia iptable_nat ipt_REJECT ipt_MASQUERADE huawei_cdc_ncm ftdi_sio dm9601 cfg80211 cdc_subset cdc_ncm cdc_ether cdc_eem ax88179_178a asix xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_ecn xt_dscp xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_NETMAP xt_LOG xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CLASSIFY usbserial usbnet usbhid slhc rtl8150 r8152 pegasus nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack
> [ 88.597894] libcrc32c kaweth iptable_mangle iptable_filter ipt_ECN ipheth ip_tables hso hid_generic crc_ccitt compat cdc_wdm cdc_acm br_netfilter hid evdev input_core nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 l2tp_netlink l2tp_core udp_tunnel ip6_udp_tunnel xfrm6_mode_tunnel xfrm6_mode_transport xfrm6_mode_beet ipcomp6 xfrm6_tunnel esp6 ah6 xfrm4_tunnel xfrm4_mode_tunnel xfrm4_mode_transport xfrm4_mode_beet ipcomp esp4 ah4 tunnel6 tunnel4 tun xfrm_user xfrm_ipcomp af_key xfrm_algo sha256_generic sha1_generic jitterentropy_rng drbg md5 hmac echainiv des_generic deflate zlib_inflate zlib_deflate cbc authenc crypto_acompress ehci_platform ehci_hcd gpio_button_hotplug usbcore nls_base usb_common crc16 mii aead crypto_null cryptomgr crc32c_generic
> [ 88.671671] crypto_hash
> [ 88.674292] Process sh (pid: 7263, threadinfo=82d5e000, task=838a1c20, tls=77f81efc)
> [ 88.682279] Stack : 00008060 00000008 00000200 00000000 00000000 00000000 00000000 00000002
> [ 88.690916] 80500000 83230080 82d5fe22 00841000 77f7adb0 00000000 00000000 83156858
> [ 88.699553] 00000000 8352fa00 83ad62b0 835302a8 00000000 300a00f8 00000003 82d5fe38
> [ 88.708190] 82d5fef4 00000001 77f54dc4 77f80000 77f7adb0 c79fe901 00000000 00000000
> [ 88.716828] 80510000 00000002 00841000 77f54dc4 77f80000 801ce4cc 0000000b 41824292
> [ 88.725465] ...
> [ 88.727994] Call Trace:
> [ 88.730532] [<80221c28>] ioread32+0x8/0x10
> [ 88.734765] Code: 00000000 8c820000 0000000f <03e00008> 00000000 08088708 00000000 aca40000 03e00008
> [ 88.744846]
> [ 88.746464] ---[ end trace db226b2de1b69b9e ]---
> [ 88.753477] Kernel panic - not syncing: Fatal exception
> [ 88.759981] Rebooting in 3 seconds..
>
> The "REG_READ(ah, AR_PHY_AGC_CONTROL)" in ath9k_hw_loadnf() does not
> like being called when the hardware is asleep, leading to this crash.
>
> The easiest way to reproduce this is trying to set nf_override while
> the hardware is down:
>
> $ ip link set down dev wlan0
> $ echo "-85" > /sys/kernel/debug/ieee80211/phy0/ath9k/nf_override
>
> Fixing this crash by waking the hardware up before trying to set the
> noise floor. Similar to what other ath9k debugfs files do.
>
> Tested on a Lima board from 8devices, which has a QCA 4531 chipset.
>
> Fixes: b90189759a7f ("ath9k: add noise floor override option")
> Cc: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Linus Lüssing <ll@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Patch applied to ath-next branch of ath.git, thanks.
12c8f3d1cdd8 ath9k: fix data bus crash when setting nf_override via debugfs
--
https://patchwork.kernel.org/project/linux-wireless/patch/20210209184352.4272-1-linus.luessing@xxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
