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BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack

read-write to 0xffff88810375d040 of 8 bytes by interrupt on cpu 0:
 ps2_handle_ack+0x147/0x340 drivers/input/serio/libps2.c:439
 atkbd_interrupt+0xbe2/0xcc0 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:602
 __handle_irq_event_percpu+0x93/0x450 kernel/irq/handle.c:156
 handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
 handle_irq_event+0x81/0x120 kernel/irq/handle.c:213
 handle_edge_irq+0x16e/0x590 kernel/irq/chip.c:819
 asm_call_irq_on_stack+0xf/0x20
 __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline]
 run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline]
 handle_irq arch/x86/kernel/irq.c:230 [inline]
 __common_interrupt arch/x86/kernel/irq.c:249 [inline]
 common_interrupt+0x8e/0x130 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:622
 decode_watchpoint kernel/kcsan/encoding.h:67 [inline]
 find_watchpoint kernel/kcsan/core.c:124 [inline]
 check_access kernel/kcsan/core.c:616 [inline]
 __tsan_read_write4+0x3c/0x180 kernel/kcsan/core.c:841
 rcu_preempt_read_exit kernel/rcu/tree_plugin.h:361 [inline]
 __rcu_read_unlock+0x3a/0x220 kernel/rcu/tree_plugin.h:396
 rcu_read_unlock include/linux/rcupdate.h:694 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:411 [inline]
 batadv_nc_worker+0xea/0xa10 net/batman-adv/network-coding.c:718
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88810375d040 of 8 bytes by task 9843 on cpu 1:
 ps2_do_sendbyte+0x1a1/0x370 drivers/input/serio/libps2.c:45
 __ps2_command+0x30d/0x990 drivers/input/serio/libps2.c:273
 ps2_command+0x51/0x90 drivers/input/serio/libps2.c:332
 atkbd_set_repeat_rate drivers/input/keyboard/atkbd.c:595 [inline]
 atkbd_event_work+0x2c5/0x300 drivers/input/keyboard/atkbd.c:649
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9843 Comm: kworker/1:5 Not tainted 5.10.0-rc5-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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