nouveau: fix migrate_to_ram() for faulting page
authorAlistair Popple <apopple@nvidia.com>
Wed, 19 Oct 2022 12:29:34 +0000 (23:29 +1100)
committerAndrew Morton <akpm@linux-foundation.org>
Fri, 21 Oct 2022 04:27:24 +0000 (21:27 -0700)
commit97061d441110528dc02972818f2f1dad485107f9
tree6192201818f25a50a4d262e80e500027da73db9b
parent71e2d666ef85d51834d658830f823560c402b8b6
nouveau: fix migrate_to_ram() for faulting page

Commit 16ce101db85d ("mm/memory.c: fix race when faulting a device private
page") changed the migrate_to_ram() callback to take a reference on the
device page to ensure it can't be freed while handling the fault.
Unfortunately the corresponding update to Nouveau to accommodate this
change was inadvertently dropped from that patch causing GPU to CPU
migration to fail so add it here.

Link: https://lkml.kernel.org/r/20221019122934.866205-1-apopple@nvidia.com
Fixes: 16ce101db85d ("mm/memory.c: fix race when faulting a device private page")
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
drivers/gpu/drm/nouveau/nouveau_dmem.c