iommu/tegra241-cmdqv: Don't run the error ISR before probe sets up vintfs

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__tegra241_cmdqv_probe() requests the error IRQ before it has allocated the
cmdqv->vintfs array and set cmdqv->num_vintfs. A CMDQV left enabled with a
latched error across a kexec fires the IRQ as soon as it is requested, and
tegra241_cmdqv_isr() then walks the uninitialized cmdqv->vintfs array.

Request the IRQ only after cmdqv->vintfs is allocated and zeroed, so that
a latched interrupt firing early runs the ISR against a valid array of NULL
slots that it safely skips.

Fixes: 918eb5c856 ("iommu/arm-smmu-v3: Add in-kernel support for NVIDIA Tegra241 (Grace) CMDQV")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Nicolin Chen 2026-07-14 13:55:01 -07:00 • committed by Will Deacon

parent a2ee315db4

commit 5acd67ceb3

1 changed files with 19 additions and 15 deletions

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drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c

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