From: Jens Freimann <jfrei@linux.vnet.ibm.com>
Date: Mon, 6 Feb 2012 09:59:05 +0000 (+0100)
Subject: KVM: s390: ignore sigp stop overinitiative
X-Git-Tag: upstream/snapshot3+hdmi~7836^2~26
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=24a13044a84be51a6a4885a72ac9d5f4ed0742d0;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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
--- 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 */