[PATCH 01/15] mac80211: split bss_info_changed method
Wen Gong
quic_wgong at quicinc.com
Tue Oct 18 01:47:35 PDT 2022
On 6/1/2022 3:39 PM, Johannes Berg wrote:
> From: Johannes Berg <johannes.berg at intel.com>
>
> Split the bss_info_changed method to vif_cfg_changed and
> link_info_changed, with the latter getting a link ID.
> Also change the 'changed' parameter to u64 already, we
> know we need that.
>
> Signed-off-by: Johannes Berg <johannes.berg at intel.com>
> ---
>
...
> diff --git a/net/mac80211/main.c b/net/mac80211/main.c
> index 0c81ae492df4..6165b90bf0e2 100644
> --- a/net/mac80211/main.c
> +++ b/net/mac80211/main.c
> @@ -199,15 +199,84 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
> return ret;
> }
>
> +#define BSS_CHANGED_VIF_CFG_FLAGS (BSS_CHANGED_ASSOC |\
> + BSS_CHANGED_IDLE |\
> + BSS_CHANGED_IBSS |\
> + BSS_CHANGED_ARP_FILTER |\
> + BSS_CHANGED_SSID)
> +
> void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
> - u32 changed)
> + u64 changed)
> {
> struct ieee80211_local *local = sdata->local;
>
> + might_sleep();
> +
> if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
> return;
>
> - drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
> + if (WARN_ON_ONCE(changed & (BSS_CHANGED_BEACON |
> + BSS_CHANGED_BEACON_ENABLED) &&
> + sdata->vif.type != NL80211_IFTYPE_AP &&
> + sdata->vif.type != NL80211_IFTYPE_ADHOC &&
> + sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
> + sdata->vif.type != NL80211_IFTYPE_OCB))
> + return;
> +
> + if (WARN_ON_ONCE(sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE ||
> + sdata->vif.type == NL80211_IFTYPE_NAN ||
> + (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
> + !sdata->vif.bss_conf.mu_mimo_owner &&
> + !(changed & BSS_CHANGED_TXPOWER))))
> + return;
> +
> + if (!check_sdata_in_driver(sdata))
> + return;
> +
> + if (changed & BSS_CHANGED_VIF_CFG_FLAGS) {
> + trace_drv_vif_cfg_changed(local, sdata, changed);
> + if (local->ops->vif_cfg_changed)
> + local->ops->vif_cfg_changed(&local->hw, &sdata->vif, changed);
> + }
> +
> + if (changed & ~BSS_CHANGED_VIF_CFG_FLAGS) {
> + /* FIXME: should be for each link */
> + trace_drv_link_info_changed(local, sdata, 0, changed);
> + if (local->ops->link_info_changed)
> + local->ops->link_info_changed(&local->hw, &sdata->vif,
> + 0, changed);
Hi Johannes,
I think you/someone will change here later for the "/* FIXME: should be
for each link */", right?
It lead error/kernel crash as below while reconfig single MLO link which
link id is 2.
When test with single MLO link which link id is 0, not found
error/kernel crash.
I think it is because the sdata->vif.bss_conf link id is 0, but
the actual MLO link id is 2 when error/kernel crash happened.
Now I did a temp workaround to skip the crash.
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 061b5460799d..46249b9919ac 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -243,7 +243,8 @@ void ieee80211_bss_info_change_notify(struct
ieee80211_sub_if_data *sdata,
local->ops->vif_cfg_changed(&local->hw, &sdata->vif, ch);
}
- if (changed & ~BSS_CHANGED_VIF_CFG_FLAGS) {
+ if (((!sdata->vif.valid_links) || (sdata->vif.valid_links &
BIT(0))) &&
+ changed & ~BSS_CHANGED_VIF_CFG_FLAGS) {
u64 ch = changed & ~BSS_CHANGED_VIF_CFG_FLAGS;
/* FIXME: should be for each link */
kernel crash:
[ 779.959413] BUG: kernel NULL pointer dereference, address:
0000000000000000
[ 779.959418] #PF: supervisor read access in kernel mode
[ 779.959421] #PF: error_code(0x0000) - not-present page
[ 779.959424] PGD 0 P4D 0
[ 779.959429] Oops: 0000 [#1] PREEMPT SMP PTI
[ 779.959433] CPU: 2 PID: 2603 Comm: kworker/2:0 Kdump: loaded Tainted:
G W OE 5.19.0-rc6+ #4
[ 779.959438] Hardware name: LENOVO 418065C/418065C, BIOS 83ET63WW
(1.33 ) 07/29/2011
[ 779.959442] Workqueue: events_freezable ieee80211_restart_work [mac80211]
[ 779.959493] RIP: 0010:ath12k_mac_link_info_changed+0x31/0xc70 [ath12k]
[ 779.959517] Code: 89 e5 41 57 41 56 49 89 d6 41 55 49 89 fd 41 54 49
89 f4 53 48 89 cb 48 83 ec 48 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31
c0 <48> 8b 06 83 e1 40 48 89 45 a0 48 8b 40 08 48 89 45 a8 0f b6 46 08
[ 779.959521] RSP: 0018:ffffbb7f4318bcf0 EFLAGS: 00010246
[ 779.959525] RAX: 0000000000000000 RBX: 00000000021424fe RCX:
00000000021424fe
[ 779.959528] RDX: ffffa0878dd95bd8 RSI: 0000000000000000 RDI:
ffffa08792b6a080
[ 779.959531] RBP: ffffbb7f4318bd60 R08: ffffffffc0e8db90 R09:
c00000010005e8a2
[ 779.959534] R10: 0000000000000000 R11: ffffbb7f4318b6b0 R12:
0000000000000000
[ 779.959536] R13: ffffa08792b6a080 R14: ffffa0878dd95bd8 R15:
ffffa08792b6a080
[ 779.959539] FS: 0000000000000000(0000) GS:ffffa088ba280000(0000)
knlGS:0000000000000000
[ 779.959542] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 779.959545] CR2: 0000000000000000 CR3: 0000000103030006 CR4:
00000000000606e0
[ 779.959548] Call Trace:
[ 779.959551] <TASK>
[ 779.959557] ath12k_mac_op_link_info_changed+0x47/0x60 [ath12k]
[ 779.959575] ieee80211_bss_info_change_notify+0x182/0x2a0 [mac80211]
[ 779.959617] ieee80211_reconfig+0xc40/0x1570 [mac80211]
[ 779.959672] ? _raw_spin_unlock_irqrestore+0x27/0x43
[ 779.959678] ? try_to_del_timer_sync+0x53/0x80
[ 779.959686] ieee80211_restart_work+0xfe/0x160 [mac80211]
[ 779.959726] process_one_work+0x227/0x440
[ 779.959732] worker_thread+0x31/0x3e0
[ 779.959736] ? process_one_work+0x440/0x440
[ 779.959739] kthread+0xfe/0x130
[ 779.959744] ? kthread_complete_and_exit+0x20/0x20
[ 779.959749] ret_from_fork+0x22/0x30
[ 779.959758] </TASK>
[ 779.959760] Modules linked in: michael_mic ath12k(OE) qmi_helpers
qrtr_mhi mhi(E) qrtr mac80211(OE) cfg80211(OE) libarc4 rfcomm bnep
nls_iso8859_1 intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm irqbypass snd_ctl_led
crct10dif_pclmul ghash_clmulni_intel snd_hda_codec_conexant
snd_hda_codec_hdmi snd_hda_codec_generic aesni_intel snd_hda_intel
snd_intel_dspcfg snd_hda_codec crypto_simd cryptd rapl intel_cstate
snd_hda_core snd_hwdep uvcvideo thinkpad_acpi videobuf2_vmalloc
videobuf2_memops videobuf2_v4l2 nvram ledtrig_audio videobuf2_common
videodev snd_pcm platform_profile snd_seq_midi snd_seq_midi_event mc
btusb i915 btrtl btbcm btintel bluetooth cec rc_core snd_rawmidi
drm_buddy ecdh_generic ecc snd_seq ttm drm_display_helper snd_seq_device
snd_timer drm_kms_helper snd i2c_algo_bit fb_sys_fops syscopyarea
sysfillrect sysimgblt soundcore mei_me mei at24 joydev input_leds
serio_raw mac_hid wmi_bmof sch_fq_codel parport_pc ppdev lp parport drm
[ 779.959856] ip_tables x_tables autofs4 crc32_pclmul sdhci_pci e1000e
firewire_ohci i2c_i801 ptp ahci pps_core psmouse libahci i2c_smbus
firewire_core cqhci lpc_ich sdhci crc_itu_t wmi video
[ 779.959883] CR2: 0000000000000000
> + }
> +
> + if (local->ops->bss_info_changed)
> + local->ops->bss_info_changed(&local->hw, &sdata->vif,
> + &sdata->vif.bss_conf, changed);
> + trace_drv_return_void(local);
> +}
> +
...
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