linux-kernel - Re: [PATCH] iommu/arm-smmu-qcom: do not register driver in probe()

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Message-ID: <02db754c-b689-45f0-92da-521e273f025e@sirena.org.uk>
Date: Wed, 21 Jan 2026 16:05:37 +0000
From: Mark Brown <broonie@...nel.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, will@...nel.org,
	robin.murphy@....com, joro@...tes.org, robin.clark@....qualcomm.com,
	hanguidong02@...il.com, quic_c_gdjako@...cinc.com,
	dmitry.baryshkov@....qualcomm.com, driver-core@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-qcom: do not register driver in probe()

On Wed, Jan 21, 2026 at 03:12:01PM +0100, Danilo Krummrich wrote:
> Commit 0b4eeee2876f ("iommu/arm-smmu-qcom: Register the TBU driver in
> qcom_smmu_impl_init") intended to also probe the TBU driver when
> CONFIG_ARM_SMMU_QCOM_DEBUG is disabled, but also moved the corresponding
> platform_driver_register() call into qcom_smmu_impl_init() which is
> called from arm_smmu_device_probe().

This fixes the boot lockup on Juno for me:

Tested-by: Mark Brown <broonie@...nel.org>

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