From 4a955bed882e734807024afd8f53213d4c61ff97 Mon Sep 17 00:00:00 2001 From: Alistair Popple Date: Mon, 14 Nov 2022 22:55:37 +1100 Subject: mm/memory: return vm_fault_t result from migrate_to_ram() callback The migrate_to_ram() callback should always succeed, but in rare cases can fail usually returning VM_FAULT_SIGBUS. Commit 16ce101db85d ("mm/memory.c: fix race when faulting a device private page") incorrectly stopped passing the return code up the stack. Fix this by setting the ret variable, restoring the previous behaviour on migrate_to_ram() failure. Link: https://lkml.kernel.org/r/20221114115537.727371-1-apopple@nvidia.com Fixes: 16ce101db85d ("mm/memory.c: fix race when faulting a device private page") Signed-off-by: Alistair Popple Acked-by: David Hildenbrand Reviewed-by: Felix Kuehling Cc: Ralph Campbell Cc: John Hubbard Cc: Alex Sierra Cc: Ben Skeggs Cc: Lyude Paul Cc: Jason Gunthorpe Cc: Michael Ellerman Signed-off-by: Andrew Morton --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/memory.c b/mm/memory.c index f88c351aecd4..8a6d5c823f91 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3763,7 +3763,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) */ get_page(vmf->page); pte_unmap_unlock(vmf->pte, vmf->ptl); - vmf->page->pgmap->ops->migrate_to_ram(vmf); + ret = vmf->page->pgmap->ops->migrate_to_ram(vmf); put_page(vmf->page); } else if (is_hwpoison_entry(entry)) { ret = VM_FAULT_HWPOISON; -- cgit v1.2.3