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Most of the calling code now has error handling that can carry an error
code further up the call chain. Keep the exported interface
iommu_domain_alloc() returning NULL and reflow the internal code to use
ERR_PTR not NULL for domain allocation failure.
Optionally allow drivers to return ERR_PTR from any of the alloc ops. Many
of the new ops (user, sva, etc) already return ERR_PTR, so having two
rules is confusing and hard on drivers. This fixes a bug in DART that was
returning ERR_PTR.
Fixes: 482feb5c64 ("iommu/dart: Call apple_dart_finalize_domain() as part of alloc_paging()")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/linux-iommu/b85e0715-3224-4f45-ad6b-ebb9f08c015d@moroto.mountain/
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Link: https://lore.kernel.org/r/0-v2-55ae413017b8+97-domain_alloc_err_ptr_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
34e2dccbb3