KVM: s390: Fix assumption that kvm_set_irq_routing is always run successfully

This fixes the assumption that kvm_set_irq_routing is always run
successfully by instead making it equal to the variable r which
we use for returning in the function kvm_arch_vm_ioctl instead
of making r equal to zero when calling this particular function
and incorrectly making the caller of kvm_arch_vm_ioctl think
the function has run successfully.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Message-Id: <1438880754-27149-1-git-send-email-xerofoify@gmail.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4bdb860b5c49..397b88dc1b2c 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -962,8 +962,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
                 if (kvm->arch.use_irqchip) {
                         /* Set up dummy routing. */
                         memset(&routing, 0, sizeof(routing));
-                        kvm_set_irq_routing(kvm, &routing, 0, 0);
-                        r = 0;
+                        r = kvm_set_irq_routing(kvm, &routing, 0, 0);
                 }
                 break;
         }