Revert "dma-mapping: clear dev->dma_ops in arch_teardown_dma_ops"
This reverts commit 46053c73. This change breaks architectures setting up dma_ops in their own magic way and not using arch_setup_dma_ops, so revert it. Reported-by: Guenter Roeck <firstname.lastname@example.org> Signed-off-by: Christoph Hellwig <email@example.com>
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