[PATCH 9/9] hw/hyperv/vmbus: replaced qemu_mutex_lock with QEMU_LOCK_GUARD

[Mahmoud Mandour <ma.mandourr@gmail.com>]

Replaced some calls to qemu_mutex_lock and their respective
qemu_mutex_unlock calls with QEMU_LOCK_GUARD macro. This simplifies
the code by removing the calls to qemu_mutex_unlock and eliminates
goto paths.

Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com>
---
 hw/hyperv/vmbus.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
index 984caf898d..7c966ae399 100644
--- a/hw/hyperv/vmbus.c
+++ b/hw/hyperv/vmbus.c
@@ -1616,11 +1616,11 @@ static int enqueue_incoming_message(VMBus *vmbus,
     int ret = 0;
     uint8_t idx, prev_size;
 
-    qemu_mutex_lock(&vmbus->rx_queue_lock);
+    QEMU_LOCK_GUARD(&vmbus->rx_queue_lock);
 
     if (vmbus->rx_queue_size == HV_MSG_QUEUE_LEN) {
         ret = -ENOBUFS;
-        goto out;
+        return ret;
     }
 
     prev_size = vmbus->rx_queue_size;
@@ -1632,8 +1632,7 @@ static int enqueue_incoming_message(VMBus *vmbus,
     if (!prev_size) {
         vmbus_resched(vmbus);
     }
-out:
-    qemu_mutex_unlock(&vmbus->rx_queue_lock);
+
     return ret;
 }
 
@@ -2189,10 +2188,10 @@ static void process_message(VMBus *vmbus)
     void *msgdata;
     uint32_t msglen;
 
-    qemu_mutex_lock(&vmbus->rx_queue_lock);
+    QEMU_LOCK_GUARD(&vmbus->rx_queue_lock);
 
     if (!vmbus->rx_queue_size) {
-        goto unlock;
+        return;
     }
 
     hv_msg = &vmbus->rx_queue[vmbus->rx_queue_head];
@@ -2241,8 +2240,6 @@ out:
     vmbus->rx_queue_head %= HV_MSG_QUEUE_LEN;
 
     vmbus_resched(vmbus);
-unlock:
-    qemu_mutex_unlock(&vmbus->rx_queue_lock);
 }
 
 static const struct {
-- 
2.25.1