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BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack

write to 0xffff8881289df040 of 8 bytes by interrupt on cpu 1:
 ps2_handle_ack+0x15a/0x350 drivers/input/serio/libps2.c:439
 atkbd_interrupt+0xbf1/0xcd0 drivers/input/keyboard/atkbd.c:434
 serio_interrupt+0x5d/0xe0 drivers/input/serio/serio.c:1002
 i8042_interrupt+0x39e/0x720 drivers/input/serio/i8042.c:598
 __handle_irq_event_percpu+0x16e/0x4f0 kernel/irq/handle.c:156
 handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
 handle_irq_event+0x94/0x140 kernel/irq/handle.c:213
 handle_edge_irq+0x18e/0x5f0 kernel/irq/chip.c:819
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 handle_irq arch/x86/kernel/irq.c:230 [inline]
 __common_interrupt arch/x86/kernel/irq.c:249 [inline]
 common_interrupt+0xf6/0x1e0 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:572
 __sb_start_write+0x30/0x150 fs/super.c:1647
 sb_start_pagefault include/linux/fs.h:1672 [inline]
 ext4_page_mkwrite+0xd3/0xae0 fs/ext4/inode.c:5971
 do_page_mkwrite mm/memory.c:2530 [inline]
 do_shared_fault+0x21e/0x7c0 mm/memory.c:3920
 do_fault mm/memory.c:3988 [inline]
 handle_pte_fault mm/memory.c:4224 [inline]
 __handle_mm_fault mm/memory.c:4359 [inline]
 handle_mm_fault+0x1710/0x1af0 mm/memory.c:4457
 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1294
 handle_page_fault arch/x86/mm/fault.c:1351 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1404
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538

read to 0xffff8881289df040 of 8 bytes by task 30895 on cpu 0:
 ps2_do_sendbyte+0x124/0x380 drivers/input/serio/libps2.c:45
 __ps2_command+0x30d/0x9f0 drivers/input/serio/libps2.c:273
 ps2_command+0x50/0x90 drivers/input/serio/libps2.c:332
 atkbd_set_repeat_rate drivers/input/keyboard/atkbd.c:595 [inline]
 atkbd_event_work+0x2b6/0x2f0 drivers/input/keyboard/atkbd.c:649
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30895 Comm: kworker/0:2 Not tainted 5.9.0-rc2-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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