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...