linux-kernel - [PATCH 6/9] KVM: Return an error code only as a constant in kvm_get_dirty_log

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Message-ID: <2f83abd2-cf68-4294-6603-cfab2991e731@users.sourceforge.net>
Date:   Sun, 22 Jan 2017 19:16:14 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 6/9] KVM: Return an error code only as a constant in
 kvm_get_dirty_log_protect()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 22 Jan 2017 17:30:16 +0100

* Return an error code without storing it in an intermediate variable.

* Delete the local variable "r" and the jump label "out" which became
  unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 virt/kvm/kvm_main.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6a74a3796b3f..a651a137ef21 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1156,24 +1156,22 @@ int kvm_get_dirty_log_protect(struct kvm *kvm,
 {
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;
-	int r, i, as_id, id;
+	int i, as_id, id;
 	unsigned long n;
 	unsigned long *dirty_bitmap;
 	unsigned long *dirty_bitmap_buffer;
 
-	r = -EINVAL;
 	as_id = log->slot >> 16;
 	id = (u16)log->slot;
 	if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
-		goto out;
+		return -EINVAL;
 
 	slots = __kvm_memslots(kvm, as_id);
 	memslot = id_to_memslot(slots, id);
 
 	dirty_bitmap = memslot->dirty_bitmap;
-	r = -ENOENT;
 	if (!dirty_bitmap)
-		goto out;
+		return -ENOENT;
 
 	n = kvm_dirty_bitmap_bytes(memslot);
 
@@ -1202,14 +1200,9 @@ int kvm_get_dirty_log_protect(struct kvm *kvm,
 	}
 
 	spin_unlock(&kvm->mmu_lock);
-
-	r = -EFAULT;
 	if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
-		goto out;
-
-	r = 0;
-out:
-	return r;
+		return -EFAULT;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
 #endif
-- 
2.11.0