6.4-stable review patch. If anyone has any objections, please let me know.
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From: David Hildenbrand david@redhat.com
[ Upstream commit ddf409851461f515cc32974714b73efe2e012bde ]
Just like we do with alloc_contig_range(), let's convert all unknown errors to -EBUSY, but WARN so we can look into the issue. For example, offline_pages() could fail with -EINTR, which would be unexpected in our case.
Signed-off-by: David Hildenbrand david@redhat.com Message-Id: 20230713145551.2824980-3-david@redhat.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/virtio/virtio_mem.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index ed15d2a4bd96b..1a76ba2bc118c 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -741,11 +741,15 @@ static int virtio_mem_offline_and_remove_memory(struct virtio_mem *vm, * immediately instead of waiting. */ virtio_mem_retry(vm); - } else { - dev_dbg(&vm->vdev->dev, - "offlining and removing memory failed: %d\n", rc); + return 0; } - return rc; + dev_dbg(&vm->vdev->dev, "offlining and removing memory failed: %d\n", rc); + /* + * We don't really expect this to fail, because we fake-offlined all + * memory already. But it could fail in corner cases. + */ + WARN_ON_ONCE(rc != -ENOMEM && rc != -EBUSY); + return rc == -ENOMEM ? -ENOMEM : -EBUSY; }
/*