From: Jens Freimann <jfrei@linux.vnet.ibm.com>
Date: Mon, 11 Aug 2014 13:39:43 +0000 (+0200)
Subject: KVM: s390: don't use kvm lock in interrupt injection code
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=331cbc277ec4ae5827b9ca538d9b5469fdca0947;p=linux-beck.git

KVM: s390: don't use kvm lock in interrupt injection code

The kvm lock protects us against vcpus going away, but they only go
away when the virtual machine is shut down. We don't need this
mutex here, so let's get rid of it.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index e2f624058457..ba89bbbd2ed5 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -991,7 +991,6 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
 				   s390int->parm64, 2);
 
-	mutex_lock(&vcpu->kvm->lock);
 	li = &vcpu->arch.local_int;
 	spin_lock(&li->lock);
 	if (inti->type == KVM_S390_PROGRAM_INT)
@@ -1003,7 +1002,6 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 		li->action_bits |= ACTION_STOP_ON_STOP;
 	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
 	spin_unlock(&li->lock);
-	mutex_unlock(&vcpu->kvm->lock);
 	kvm_s390_vcpu_wakeup(vcpu);
 	return 0;
 }