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It doesn't make senst to update a request that was not created. So, instead of using cpu_latency_qos_update_request(), let's use, instead cpu_latency_qos_add_request() at device probing code. This should fix this issue: [ 9.691775] cpu_latency_qos_update_request called for unknown object [ 9.695279] WARNING: CPU: 3 PID: 523 at kernel/power/qos.c:296 cpu_latency_qos_update_request+0x3a/0xb0 [ 9.698826] Modules linked in: snd_soc_acpi_intel_match snd_rawmidi snd_soc_acpi snd_soc_rl6231 snd_soc_core ath mac80211 snd_compress snd_hdmi_lpe_audio ac97_bus hid_sensor_accel_3d snd_pcm_dmaengine hid_sensor_gyro_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common processor_thermal_device industrialio cfg80211 snd_pcm snd_seq intel_rapl_common atomisp(C+) libarc4 intel_soc_dts_iosf cros_ec_ishtp intel_xhci_usb_role_switch mei_txe cros_ec videobuf_vmalloc mei roles atomisp_ov2680(C) videobuf_core snd_seq_device snd_timer spi_pxa2xx_platform videodev snd mc dw_dmac intel_hid dw_dmac_core 8250_dw soundcore int3406_thermal int3400_thermal intel_int0002_vgpio acpi_pad acpi_thermal_rel soc_button_array int3403_thermal int340x_thermal_zone mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_sensor_custom hid_sensor_hub intel_ishtp_loader intel_ishtp_hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i915 mmc_block i2c_algo_bit [ 9.698885] aesni_intel crypto_simd drm_kms_helper cryptd syscopyarea sysfillrect glue_helper sysimgblt fb_sys_fops cec intel_ish_ipc drm lpc_ich intel_ishtp hid_asus intel_soc_pmic_chtdc_ti asus_wmi i2c_hid sparse_keymap sdhci_acpi wmi video sdhci hid_generic usbhid hid [ 9.736699] CPU: 3 PID: 523 Comm: systemd-udevd Tainted: G C 5.7.0-rc1+ #2 [ 9.741309] Hardware name: ASUSTeK COMPUTER INC. T101HA/T101HA, BIOS T101HA.305 01/24/2018 [ 9.745962] RIP: 0010:cpu_latency_qos_update_request+0x3a/0xb0 [ 9.750615] Code: 89 e5 41 55 41 54 41 89 f4 53 48 89 fb 48 81 7f 28 e0 7f c6 9e 74 1c 48 c7 c6 60 f3 65 9e 48 c7 c7 e8 a9 99 9e e8 b2 a6 f9 ff <0f> 0b 5b 41 5c 41 5d 5d c3 0f 1f 44 00 00 44 3b 23 74 ef 44 89 e2 [ 9.760065] RSP: 0018:ffffa865404f39c0 EFLAGS: 00010282 [ 9.764734] RAX: 0000000000000000 RBX: ffff9d2aefc84350 RCX: 0000000000000000 [ 9.769435] RDX: ffff9d2afbfa97c0 RSI: ffff9d2afbf99808 RDI: ffff9d2afbf99808 [ 9.774125] RBP: ffffa865404f39d8 R08: 0000000000000304 R09: 0000000000aaaaaa [ 9.778804] R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffff [ 9.783491] R13: ffff9d2afb4640b0 R14: ffffffffc07ecf20 R15: 0000000091000000 [ 9.788187] FS: 00007efe67ff8880(0000) GS:ffff9d2afbf80000(0000) knlGS:0000000000000000 [ 9.792864] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9.797482] CR2: 00007ffc6424bdc8 CR3: 0000000178998000 CR4: 00000000001006e0 [ 9.802126] Call Trace: [ 9.806775] atomisp_pci_probe.cold.19+0x15f/0x116f [atomisp] [ 9.811441] local_pci_probe+0x47/0x80 [ 9.816085] pci_device_probe+0xff/0x1b0 [ 9.820706] really_probe+0x1c8/0x3e0 [ 9.825247] driver_probe_device+0xd9/0x120 [ 9.829769] device_driver_attach+0x58/0x60 [ 9.834294] __driver_attach+0x8f/0x150 [ 9.838782] ? device_driver_attach+0x60/0x60 [ 9.843205] ? device_driver_attach+0x60/0x60 [ 9.847634] bus_for_each_dev+0x79/0xc0 [ 9.852033] ? kmem_cache_alloc_trace+0x167/0x230 [ 9.856462] driver_attach+0x1e/0x20 Reported-by: Patrik Gfeller <patrik.gfeller@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.