KVM: s390: ignore sigp stop overinitiative

In __inject_sigp_stop() do nothing when the CPU is already in stopped
state.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index c703b1c..f3d5cc2 100644 (file)
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -160,12 +160,15 @@ static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
        inti->type = KVM_S390_SIGP_STOP;
 
        spin_lock_bh(&li->lock);
+       if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED))
+               goto out;
        list_add_tail(&inti->list, &li->list);
        atomic_set(&li->active, 1);
        atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
        li->action_bits |= action;
        if (waitqueue_active(&li->wq))
                wake_up_interruptible(&li->wq);
+out:
        spin_unlock_bh(&li->lock);
 
        return 0; /* order accepted */