I just hit this warning using the 3.17.0-rc7 version of the driver:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12436 at drivers/net/wireless/iwlwifi/mvm/tx.c:190 iwl_mvm_set_tx_params+0x336/0x463 [iwlmvm]()
Got an HT rate for a non data frame 0x8
Modules linked in: ext3 jbd tcp_diag inet_diag qmi_wwan option usb_wwan uas usb_storage xt_state ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge cpuid ctr ccm nfnetlink_log nfnetlink usb_serial_simple usbserial xt_multiport iptable_filter ip_tables bnep dm_mod xt_hl nf_log_ipv6 nf_log_common xt_LOG binfmt_misc ip6table_filter ip6_tables x_tables nfsd nfs_acl nfs lockd fscache sunrpc 8021q garp stp mrp llc tun loop fuse snd_hda_codec_conexant snd_hda_codec_generic iTCO_wdt iTCO_vendor_support arc4 coretemp cdc_mbim kvm_intel cdc_wdm kvm cdc_ncm evdev usbnet mii uvcvideo cdc_acm psmouse videobuf2_vmalloc videobuf2_memops videobuf2_core serio_raw v4l2_common videodev i2c_i801 iwlmvm mac80211 snd_hda_intel snd_hda_controller snd_hda_codec
snd_hwdep snd_pcm_oss snd_mixer_oss iwlwifi lpc_ich mfd_core i915 snd_pcm i2c_algo_bit drm_kms_helper cfg80211 snd_timer drm wmi thinkpad_acpi nvram ac snd soundcore battery ecb btusb bluetooth video rfkill button acpi_cpufreq processor ext4 crc16 jbd2 mbcache nbd sg sd_mod crc_t10dif sr_mod crct10dif_generic cdrom crct10dif_common microcode ahci libahci libata scsi_mod ehci_pci uhci_hcd ehci_hcd e1000e ptp pps_core usbcore usb_common thermal thermal_sys [last unloaded: dummy]
CPU: 0 PID: 12436 Comm: wpa_supplicant Tainted: G O 3.17.0-rc7+ #262
Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
0000000000000009 ffff8802321bb748 ffffffff813bea47 0000000000000000
ffff8802321bb798 ffff8802321bb788 ffffffff8103eb60 0000000000000020
ffffffffa0640047 ffff8800b1d9bdc0 ffff88022f666c00 ffff88007f9f2a48
Call Trace:
[<ffffffff813bea47>] dump_stack+0x4e/0x68
[<ffffffff8103eb60>] warn_slowpath_common+0x7c/0x96
[<ffffffffa0640047>] ? iwl_mvm_set_tx_params+0x336/0x463 [iwlmvm]
[<ffffffff8103ec0e>] warn_slowpath_fmt+0x41/0x43
[<ffffffffa0640047>] iwl_mvm_set_tx_params+0x336/0x463 [iwlmvm]
[<ffffffffa0640663>] iwl_mvm_tx_skb+0x29f/0x30a [iwlmvm]
[<ffffffffa06391a7>] iwl_mvm_mac_tx+0xbc/0x1ae [iwlmvm]
[<ffffffffa059ff36>] __ieee80211_tx+0x28a/0x2f7 [mac80211]
[<ffffffffa05a1ade>] ieee80211_tx+0xbf/0xd1 [mac80211]
[<ffffffffa05a1b7c>] ieee80211_xmit+0x8c/0x95 [mac80211]
[<ffffffffa05a286d>] ieee80211_subif_start_xmit+0x9df/0xa3a [mac80211]
[<ffffffff812f813a>] dev_hard_start_xmit+0x287/0x3e5
[<ffffffff813142fd>] sch_direct_xmit+0x70/0x179
[<ffffffff812f115d>] ? spin_lock+0x9/0xb
[<ffffffff812f8578>] __dev_queue_xmit+0x2e0/0x4e0
[<ffffffff812f878e>] dev_queue_xmit+0xb/0xd
[<ffffffff813aec11>] packet_sendmsg+0xb5d/0xbda
[<ffffffff8106478e>] ? sched_clock_cpu+0xa4/0xbe
[<ffffffff812de615>] __sock_sendmsg_nosec+0x25/0x27
[<ffffffff812e0f4e>] sock_sendmsg+0x5a/0x7b
[<ffffffff81107686>] ? might_fault+0x55/0xa5
[<ffffffff812de93e>] ? copy_from_user+0x2a/0x2c
[<ffffffff812e1d80>] SYSC_sendto+0x10a/0x139
[<ffffffff810718c9>] ? trace_hardirqs_off_caller+0x37/0xa6
[<ffffffff813c53cd>] ? retint_swapgs+0xe/0x13
[<ffffffff81075976>] ? trace_hardirqs_on_caller+0x145/0x1a1
[<ffffffff811ee62e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff812e1f75>] SyS_sendto+0x9/0xb
[<ffffffff813c4852>] system_call_fastpath+0x16/0x1b
---[ end trace eda735e0dce4402f ]---
Looking at the code didn't make it clear to me whether this was
something you wanted reported or not, so I chose to report it just in
case. FWIW, the access point in use at this time was a Cisco/Linksys
EA6700, connected on 2.4 Ghz with somewhat low signal and lots of noise
around. This is the view a few minutes later from the same position:
nemi:/home/bjorn# iw wlan0 link
Connected to c8:d7:19:37:f5:94 (on wlan0)
SSID: Kjellerbod
freq: 2417
RX: 140862560 bytes (120659 packets)
TX: 8919736 bytes (56267 packets)
signal: -69 dBm
tx bitrate: 86.7 MBit/s MCS 12 short GI
bss flags: short-preamble short-slot-time
dtim period: 1
beacon int: 100
nemi:/home/bjorn# iw wlan0 station dump
Station c8:d7:19:37:f5:94 (on wlan0)
inactive time: 2884 ms
rx bytes: 140863633
rx packets: 120669
tx bytes: 8919994
tx packets: 56270
tx retries: 11612
tx failed: 10
signal: -74 [-74] dBm
signal avg: -72 [-72] dBm
tx bitrate: 86.7 MBit/s MCS 12 short GI
rx bitrate: 39.0 MBit/s MCS 10
authorized: yes
authenticated: yes
preamble: long
WMM/WME: yes
MFP: no
TDLS peer: no
Bjørn
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