[PATCH] KVM: fix the errno of ioctl KVM_[UN]REGISTER_COALESCED_MMIO failure

[Wei Yongjun]

This patch change the errno of ioctl KVM_[UN]REGISTER_COALESCED_MMIO
from -EINVAL to -ENXIO if no coalesced mmio dev exists.

Signed-off-by: Wei Yongjun <yj...@cn.fujitsu.com>
---
 virt/kvm/coalesced_mmio.c |    4 ++--
 virt/kvm/kvm_main.c       |    2 --
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 5169736..22500d4 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -138,7 +138,7 @@ int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
        struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
 
        if (dev == NULL)
-               return -EINVAL;
+               return -ENXIO;
 
        mutex_lock(&kvm->slots_lock);
        if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) {
@@ -161,7 +161,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
        struct kvm_coalesced_mmio_zone *z;
 
        if (dev == NULL)
-               return -EINVAL;
+               return -ENXIO;
 
        mutex_lock(&kvm->slots_lock);
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0e06a6d..861435e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1603,7 +1603,6 @@ static long kvm_vm_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&zone, argp, sizeof zone))
                        goto out;
-               r = -ENXIO;
                r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
                if (r)
                        goto out;
@@ -1615,7 +1614,6 @@ static long kvm_vm_ioctl(struct file *filp,
                r = -EFAULT;
                if (copy_from_user(&zone, argp, sizeof zone))
                        goto out;
-               r = -ENXIO;
                r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
                if (r)
                        goto out;
-- 
1.6.3.3


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