coresight/ultrasoc: change smb_drv_data spinlock's type to raw_spinlock_t

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In ultrasoc-smb drivers, smb_drv_data->spinlock can be held
during __schedule() by perf_event_task_sched_out()/in().

Since smb__drv_data->spinlock type is spinlock_t and
perf_event_task_sched_out()/in() is called after acquiring rq_lock,
which is raw_spinlock_t (an unsleepable lock),
this poses an issue in PREEMPT_RT kernel where spinlock_t is sleepable.

To address this, change type smb_drv_data->spinlock in ultrasoc-smb drivers,
which can be called by perf_event_task_sched_out()/in(),
from spinlock_t to raw_spinlock_t.

Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250306121110.1647948-10-yeoreum.yun@arm.com

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Yeoreum Yun 2025-03-06 12:11:10 +00:00 • committed by Suzuki K Poulose

parent db11f75bc2

commit d11eb31db2

2 changed files with 7 additions and 7 deletions

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12

drivers/hwtracing/coresight/ultrasoc-smb.c

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2

drivers/hwtracing/coresight/ultrasoc-smb.h

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