s390/uv: Don't call folio_wait_writeback() without a folio reference

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folio_wait_writeback() requires that no spinlocks are held and that
a folio reference is held, as documented. After we dropped the PTL, the
folio could get freed concurrently. So grab a temporary reference.

Fixes: 214d9bbcd3 ("s390/mm: provide memory management functions for protected KVM guests")
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240508182955.358628-2-david@redhat.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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David Hildenbrand 2024-05-08 20:29:46 +02:00 • committed by Alexander Gordeev

parent c3f38fa61a

commit 3f29f6537f

1 changed files with 8 additions and 0 deletions

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arch/s390/kernel/uv.c

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