Take a look at this code for example. But all the places which call
get_domain() are the same:
drivers/iommu/amd_iommu.c
2648 page = virt_to_page(virt_addr);
2649 size = PAGE_ALIGN(size);
2650
2651 domain = get_domain(dev);
^^^^^^^^^^^^^^
imagined get_domain() returns NULL.
2652 if (IS_ERR(domain))
2653 goto free_mem;
2654
2655 dma_dom = to_dma_ops_domain(domain);
^^^^^^^^^^^^^^^^^^^^^^^^^
This will Oops.
2656
regards,
dan carpenter
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