Re: tpm: spi: do not call blocking ops when !TASK_RUNNING; during shutdown

[Jarkko Sakkinen <jarkko@kernel.org>]

Hi Stefan,

On Mon, Apr 20, 2026 at 12:25:21PM +0200, Stefan Wahren wrote:
> Hi,
> we use a custom i.MX93 board, which based on Phytec Phycore i.MX93 with a
> TPM connected via SPI. If I enable CONFIG_DEBUG_ATOMIC_SLEEP=y in our kernel
> config with mainline kernel 6.18.23 and reboot our board, I will get the
> following warning:

Please provide results with the latest mainline kernel.

> 
> [   43.287416] do not call blocking ops when !TASK_RUNNING; state=1 set at
> [<000000005a2107f3>] prepare_to_wait_event+0x54/0x14c
> [   43.299009] WARNING: CPU: 0 PID: 1 at kernel/sched/core.c:8857
> __might_sleep+0x74/0x7c
> [   43.306920] Modules linked in: polyval_ce flexcan rtc_rv3028 can_dev
> mse102x phy_can_transceiver fuse autofs4
> [   43.316838] CPU: 0 UID: 0 PID: 1 Comm: systemd-shutdow Not tainted
> 6.18.23-00002-g626a194342f0 #2 PREEMPT
> [   43.326471] Hardware name: chargebyte Charge SOM Evaluation Kit (DT)
> [   43.332807] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS
> BTYPE=--)
> [   43.339757] pc : __might_sleep+0x74/0x7c
> [   43.343675] lr : __might_sleep+0x74/0x7c
> [   43.347592] sp : ffff800081aab720
> [   43.350894] x29: ffff800081aab720 x28: 0000000000000080 x27:
> ffff000000235880
> [   43.358018] x26: ffff800081897000 x25: 0000000000000018 x24:
> 0000000000000000
> [   43.365142] x23: ffff800081aab907 x22: 0000000000000000 x21:
> 0000000000000080
> [   43.372266] x20: 000000000000010f x19: ffff80008131cd00 x18:
> 0000000000000001
> [   43.379390] x17: 0000000000000000 x16: 000000000017d600 x15:
> ffff00003fda4680
> [   43.386514] x14: 0000000000017e01 x13: 0000000000000209 x12:
> 0000000000000000
> [   43.393638] x11: 00000000000000c0 x10: 0000000000000950 x9 :
> ffff800081aab5a0
> [   43.400762] x8 : ffff0000000d89b0 x7 : ffff00003fda3f00 x6 :
> 000000013417d29a
> [   43.407886] x5 : 0000000000000000 x4 : 0000000000000002 x3 :
> 0000000000000010
> [   43.415010] x2 : 0000000000000000 x1 : 0000000000000000 x0 :
> ffff0000000d8000
> [   43.422135] Call trace:
> [   43.424570]  __might_sleep+0x74/0x7c (P)
> [   43.428487]  mutex_lock+0x24/0x80
> [   43.431797]  spi_bus_lock+0x20/0x50
> [   43.435281]  tpm_tis_spi_transfer_full+0x70/0x2c4
> [   43.439979]  tpm_tis_spi_read_bytes+0x3c/0x48
> [   43.444321]  tpm_tis_status+0x58/0xf8
> [   43.447978]  wait_for_tpm_stat_cond+0x30/0x90
> [   43.452329]  wait_for_tpm_stat+0x1cc/0x2e0
> [   43.456419]  tpm_tis_send_data+0xdc/0x334
> [   43.460423]  tpm_tis_send_main+0x74/0x160
> [   43.464427]  tpm_tis_send+0xd4/0x13c
> [   43.467998]  tpm_transmit+0xc4/0x3c4
> [   43.471569]  tpm_transmit_cmd+0x38/0xd4
> [   43.475399]  tpm2_shutdown+0x6c/0xa4
> [   43.478970]  tpm_class_shutdown+0x60/0x88
> [   43.482974]  device_shutdown+0x130/0x25c
> [   43.486891]  kernel_restart+0x44/0xa4
> [   43.490549]  __do_sys_reboot+0x114/0x254
> [   43.494466]  __arm64_sys_reboot+0x24/0x30
> [   43.498470]  invoke_syscall+0x48/0x10c
> [   43.502214]  el0_svc_common.constprop.0+0x40/0xe0
> [   43.506911]  do_el0_svc+0x1c/0x28
> [   43.510222]  el0_svc+0x34/0xec
> [   43.513273]  el0t_64_sync_handler+0xa0/0xe4
> [   43.517441]  el0t_64_sync+0x198/0x19c
> 
> Best regards

BR, Jarkko