CVE-2025-21912: In the Linux kernel, the following vulnerability has been resolved:  gpio: rcar: Use raw_spinlock to protect register access  Use raw_spinlock in order to fix spurious messages about invalid context when spinlock debugging is enabled. The lock is only used to serialize register access.      [    4.239592] =============================     [    4.239595] [ BUG: Invalid wait context ]     [    4.239599] 6.13.0-rc7-arm64-renesas-05496-gd088502a519f #35 Not tainted     [    4.239603] -----------------------------     [    4.239606] kworker/u8:5/76 is trying to lock:     [    4.239609] ffff0000091898a0 (&p->lock){....}-{3:3}, at: gpio_rcar_config_interrupt_input_mode+0x34/0x164     [    4.239641] other info that might help us debug this:     [    4.239643] context-{5:5}     [    4.239646] 5 locks held by kworker/u8:5/76:     [    4.239651]  #0: ffff0000080fb148 ((wq_completion)async){+.+.}-{0:0}, at: process_one_work+0x190/0x62c     [    4.250180] OF: /soc/sound@ec500000/ports/port@0/endpoint: Read of boolean property 'frame-master' with a value.     [    4.254094]  #1: ffff80008299bd80 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work+0x1b8/0x62c     [    4.254109]  #2: ffff00000920c8f8     [    4.258345] OF: /soc/sound@ec500000/ports/port@1/endpoint: Read of boolean property 'bitclock-master' with a value.     [    4.264803]  (&dev->mutex){....}-{4:4}, at: __device_attach_async_helper+0x3c/0xdc     [    4.264820]  #3: ffff00000a50ca40 (request_class#2){+.+.}-{4:4}, at: __setup_irq+0xa0/0x690     [    4.264840]  #4:     [    4.268872] OF: /soc/sound@ec500000/ports/port@1/endpoint: Read of boolean property 'frame-master' with a value.     [    4.273275] ffff00000a50c8c8 (lock_class){....}-{2:2}, at: __setup_irq+0xc4/0x690     [    4.296130] renesas_sdhi_internal_dmac ee100000.mmc: mmc1 base at 0x00000000ee100000, max clock rate 200 MHz     [    4.304082] stack backtrace:     [    4.304086] CPU: 1 UID: 0 PID: 76 Comm: kworker/u8:5 Not tainted 6.13.0-rc7-arm64-renesas-05496-gd088502a519f #35     [    4.304092] Hardware name: Renesas Salvator-X 2nd version board based on r8a77965 (DT)     [    4.304097] Workqueue: async async_run_entry_fn     [    4.304106] Call trace:     [    4.304110]  show_stack+0x14/0x20 (C)     [    4.304122]  dump_stack_lvl+0x6c/0x90     [    4.304131]  dump_stack+0x14/0x1c     [    4.304138]  __lock_acquire+0xdfc/0x1584     [    4.426274]  lock_acquire+0x1c4/0x33c     [    4.429942]  _raw_spin_lock_irqsave+0x5c/0x80     [    4.434307]  gpio_rcar_config_interrupt_input_mode+0x34/0x164     [    4.440061]  gpio_rcar_irq_set_type+0xd4/0xd8     [    4.444422]  __irq_set_trigger+0x5c/0x178     [    4.448435]  __setup_irq+0x2e4/0x690     [    4.452012]  request_threaded_irq+0xc4/0x190     [    4.456285]  devm_request_threaded_irq+0x7c/0xf4     [    4.459398] ata1: link resume succeeded after 1 retries     [    4.460902]  mmc_gpiod_request_cd_irq+0x68/0xe0     [    4.470660]  mmc_start_host+0x50/0xac     [    4.474327]  mmc_add_host+0x80/0xe4     [    4.477817]  tmio_mmc_host_probe+0x2b0/0x440     [    4.482094]  renesas_sdhi_probe+0x488/0x6f4     [    4.486281]  renesas_sdhi_internal_dmac_probe+0x60/0x78     [    4.491509]  platform_probe+0x64/0xd8     [    4.495178]  really_probe+0xb8/0x2a8     [    4.498756]  __driver_probe_device+0x74/0x118     [    4.503116]  driver_probe_device+0x3c/0x154     [    4.507303]  __device_attach_driver+0xd4/0x160     [    4.511750]  bus_for_each_drv+0x84/0xe0     [    4.515588]  __device_attach_async_helper+0xb0/0xdc     [    4.520470]  async_run_entry_fn+0x30/0xd8     [    4.524481]  process_one_work+0x210/0x62c     [    4.528494]  worker_thread+0x1ac/0x340     [    4.532245]  kthread+0x10c/0x110     [    4.535476]  ret_from_fork+0x10/0x20