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BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack

write to 0xffff8881290f7040 of 8 bytes by interrupt on cpu 1:
 ps2_handle_ack+0xec/0x240 drivers/input/serio/libps2.c:439
 atkbd_interrupt+0x614/0xcb0 drivers/input/keyboard/atkbd.c:393
 serio_interrupt+0x70/0x100 drivers/input/serio/serio.c:1002
 i8042_interrupt+0x2d4/0x510 drivers/input/serio/i8042.c:596
 __handle_irq_event_percpu+0x9a/0x430 kernel/irq/handle.c:149
 handle_irq_event_percpu+0x4b/0xe0 kernel/irq/handle.c:189
 handle_irq_event+0x85/0xca kernel/irq/handle.c:206
 handle_edge_irq+0x1a4/0x4a0 kernel/irq/chip.c:830
 generic_handle_irq_desc include/linux/irqdesc.h:156 [inline]
 do_IRQ+0x7c/0x130 arch/x86/kernel/irq.c:250
 ret_from_intr+0x0/0x21

read to 0xffff8881290f7040 of 8 bytes by task 18596 on cpu 0:
 ps2_do_sendbyte+0x118/0x320 drivers/input/serio/libps2.c:45
 __ps2_command+0x2c7/0xa50 drivers/input/serio/libps2.c:273
 ps2_command+0x60/0xc0 drivers/input/serio/libps2.c:332
 atkbd_set_repeat_rate+0x205/0x260 drivers/input/keyboard/atkbd.c:554
 atkbd_event_work+0xb0/0xf0 drivers/input/keyboard/atkbd.c:608
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18596 Comm: kworker/0:9 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events atkbd_event_work
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