[PATCH v3 1/8] KVM: s390: Remove user triggerable WARN_ON

[Christian Borntraeger <borntraeger@linux.ibm.com>]

pin_map_page() fails legitimately whenever the userspace mapping behind
the adapter route has gone away, e.g. when the VMM unmaps that memory.
As this can happen without a kernel programming error, remove the
WARN_ON.

Fixes: 1e95e3bc6b05 ("KVM: s390: Enable adapter_indicators_set to use mapped pages")
Cc: Douglas Freimuth <freimuth@linux.ibm.com>
Cc: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Douglas Freimuth <freimuth@linux.ibm.com>
---
 arch/s390/kvm/interrupt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 8f24bcd1a6d3..23f0e0821474 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -3013,7 +3013,7 @@ static int adapter_indicators_set(struct kvm *kvm,
 	if (!summary_info) {
 		spin_unlock_irqrestore(&adapter->maps_lock, flags);
 		summary_page = pin_map_page(kvm, adapter_int->summary_addr, 0);
-		if (WARN_ON_ONCE(!summary_page))
+		if (!summary_page)
 			return -1;
 		idx = srcu_read_lock(&kvm->srcu);
 		map = page_address(summary_page);
-- 
2.53.0