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Subject[PATCH 3/6] KVM: x86: remove always equal to 0 return val of kvm_vm_ioctl_get_pit2()
Date
From: Miaohe Lin <linmiaohe@huawei.com>

The return val of kvm_vm_ioctl_get_pit2() is always equal to 0, which means
there is no way to failed with this function. So remove the return val as
it's unnecessary to check against it.
Also add BUILD_BUG_ON to guard against channels size changed unexpectly.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
arch/x86/kvm/x86.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5628dceb9fa5..637d5c6b92be 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4621,15 +4621,17 @@ static void kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
mutex_unlock(&pit->pit_state.lock);
}

-static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
+static void kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
{
+ BUILD_BUG_ON(sizeof(ps->channels) !=
+ sizeof(kvm->arch.vpit->pit_state.channels));
+
mutex_lock(&kvm->arch.vpit->pit_state.lock);
memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
sizeof(ps->channels));
ps->flags = kvm->arch.vpit->pit_state.flags;
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
memset(&ps->reserved, 0, sizeof(ps->reserved));
- return 0;
}

static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
@@ -5003,9 +5005,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
- r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
- if (r)
- goto out;
+ kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
r = -EFAULT;
if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
goto out;
--
2.19.1
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