imx8m-blk-ctrl: WARNING, no release() function

[Francesco Dolcini]

Hello,
on v6.13-rc2 (PREEMPT_RT, if it matters), I have the following warning

[    4.615793] ------------[ cut here ]------------
[    4.615814] Device 'mediablk-mipi-csi2-1' does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.
[    4.618977] WARNING: CPU: 1 PID: 11 at /drivers/base/core.c:2569 device_release+0x80/0x94
[    4.638974] Modules linked in: ecdh_generic ecc etnaviv(+) rfkill libaes samsung_dsim gpu_sched imx_sdma(+) governor_userspace imx_bus dwc3_imx8mp spi_nxp_fspi lontium_lt8912b ina2xx snd_soc_wm8904 ti_ads1015 industrialio_triggered_buffer kfifo_buf lm75 snvs_pwrkey pwm_imx27 nvmem_snvs_lpgpr imx8mm_thermal caam flexcan error can_dev spi_imx usb_conn_gpio display_connector roles gpio_keys fuse ipv6 autofs4
[    4.639073] CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.13.0-rc2-0.0.0-devel-00040-ga1625b19385c #1
[    4.639082] Hardware name: Toradex Verdin iMX8M Plus WB on Dahlia Board (DT)
[    4.639087] Workqueue: events_unbound deferred_probe_work_func
[    4.639099] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    4.639107] pc : device_release+0x80/0x94
[    4.639116] lr : device_release+0x80/0x94
[    4.639122] sp : ffff80008142b910
[    4.639125] x29: ffff80008142b910 x28: 00000000fffffdfb x27: ffff000005c92180
[    4.639137] x26: ffff000000018028 x25: ffff000000046dc0 x24: ffff800080c43710
[    4.639147] x23: 0000000100000001 x22: 0000000000000000 x21: ffff800080e43750
[    4.639158] x20: 0000000000000000 x19: ffff000007cb06d8 x18: 0000000000000006
[    4.639168] x17: 0000000000000001 x16: 0000000000000000 x15: 0000000000000002
[    4.639179] x14: 0000000000001400 x13: ffff0000000a9110 x12: 0000000000225510
[    4.639190] x11: 0000000000000000 x10: 00000000000009c0 x9 : ffff80008142b790
[    4.639200] x8 : ffff00000013bba0 x7 : 000000000000002d x6 : 000000000113158e
[    4.639210] x5 : 00000001134e0800 x4 : 0000000000000002 x3 : ffff000003b04c50
[    4.639221] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00000013b180
[    4.639231] Call trace:
[    4.639235]  device_release+0x80/0x94 (P)
[    4.639245]  device_release+0x80/0x94 (L)
[    4.639253]  kobject_put+0xb0/0x214
[    4.639264]  put_device+0x14/0x24
[    4.639272]  genpd_remove+0x114/0x248
[    4.639281]  pm_genpd_remove+0x30/0x58
[    4.639288]  imx8m_blk_ctrl_probe+0x36c/0x540
[    4.639299]  platform_probe+0x68/0xdc
[    4.639308]  really_probe+0xc0/0x39c
[    4.639315]  __driver_probe_device+0x7c/0x14c
[    4.639322]  driver_probe_device+0x3c/0x120
[    4.639329]  __device_attach_driver+0xbc/0x160
[    4.639336]  bus_for_each_drv+0x88/0xe8
[    4.639346]  __device_attach+0xa0/0x1b4
[    4.639353]  device_initial_probe+0x14/0x20
[    4.639360]  bus_probe_device+0xb0/0xbc
[    4.639366]  deferred_probe_work_func+0xa0/0xf0
[    4.639373]  process_one_work+0x148/0x284
[    4.639383]  worker_thread+0x2d0/0x3e4
[    4.639391]  kthread+0x110/0x114
[    4.639399]  ret_from_fork+0x10/0x20
[    4.639409] ---[ end trace 0000000000000000 ]---

and more for other devices, from the same driver.

Just reporting for the moment, in case someone has some ideas or wants to
have a look.

Francesco