[PATCH] arm64: Properly clean up iommu-dma remnants

[Nicolin Chen]

On Tue, Apr 30, 2024 at 11:22:53AM +0100, Robin Murphy wrote:
> Thanks to the somewhat asymmetrical nature, while removing
> iommu_setup_dma_ops() from the arch_setup_dma_ops() flow, I managed to
> forget that arm64's teardown path was also specific to iommu-dma. Clean
> that up to match, otherwise probe deferral will lead to the arch code
> erroneously removing DMA ops set elsewhere.
> 
> Reported-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> Link: https://lore.kernel.org/linux-iommu/Zi_LV28TR-P-PzXi@eriador.lumag.spb.ru/
> Fixes: b67483b3c44e ("iommu/dma: Centralise iommu_setup_dma_ops()")
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>

This fixes the breakage occurring to my system too. Thanks!

Tested-by: Nicolin Chen <nicolinc at nvidia.com>