[PATCH 11/23] KVM: arm/arm64: vgic-its: Properly check the unmapped coll in DISCARD handler

Marc Zyngier
2020-01-30T13:29:33Z

From: Zenghui Yu <yuzenghui@huawei.com>

Discard is supposed to fail if the collection is not mapped to any
target redistributor. We currently check if the collection is mapped
by "ite->collection" but this is incomplete (e.g., mapping a LPI to
an unmapped collection also results in a non NULL ite->collection).
What actually needs to be checked is its_is_collection_mapped(), let's
turn to it.

Also take this chance to remove an extra blank line.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200114112212.1411-1-yuzenghui@huawei.com
---
virt/kvm/arm/vgic/vgic-its.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 17920d1b350a..d53d34a33e35 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -839,9 +839,8 @@ static int vgic_its_cmd_handle_discard(struct kvm *kvm, struct vgic_its *its,
u32 event_id = its_cmd_get_id(its_cmd);
struct its_ite *ite;

-
ite = find_ite(its, device_id, event_id);
- if (ite && ite->collection) {
+ if (ite && its_is_collection_mapped(ite->collection)) {
/*
* Though the spec talks about removing the pending state, we
* don't bother here since we clear the ITTE anyway and the
--
2.20.1