Re: [PATCH v4 0/8] coresight: Fix device registration and unregistration

[Leo Yan]

On Mon, Feb 23, 2026 at 01:28:03PM +0000, Suzuki K Poulose wrote:

[...]

> [  827.216924]  Possible unsafe locking scenario:
> [  827.216924]
> [  827.222849]        CPU0                    CPU1
> [  827.227380]        ----                    ----
> [  827.231912]   lock(coresight_mutex);
> [  827.235491]                                lock(ect_mutex);
> [  827.241073]                                lock(coresight_mutex);
> [  827.247176]   lock(ect_mutex);
> [  827.250233]
> [  827.250233]  *** DEADLOCK ***

Thanks for the test, Suzuki.

I have sent a refactor patch to dismiss locking chain:
https://lore.kernel.org/linux-arm-kernel/20260224-arm_coresight_refactor_cti_resource_release-v1-1-ff1b2bca9176@xxxxxxx/T/#u

For recording, I enabled the following configs to reproduce the lockdep
report:

  CONFIG_LOCKUP_DETECTOR
  CONFIG_PROVE_LOCKING

Thanks,
Leo