[PATCH 4/9] util/vfio-helpers: Replace qemu_mutex_lock() calls with QEMU_LOCK_GUARD

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Simplify qemu_vfio_dma_[un]map() handlers by replacing a pair of
qemu_mutex_lock/qemu_mutex_unlock calls by the WITH_QEMU_LOCK_GUARD
macro.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 util/vfio-helpers.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index 1d149136299..d956866b4e9 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -735,7 +735,7 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
     assert(QEMU_PTR_IS_ALIGNED(host, qemu_real_host_page_size));
     assert(QEMU_IS_ALIGNED(size, qemu_real_host_page_size));
     trace_qemu_vfio_dma_map(s, host, size, temporary, iova);
-    qemu_mutex_lock(&s->lock);
+    QEMU_LOCK_GUARD(&s->lock);
     mapping = qemu_vfio_find_mapping(s, host, &index);
     if (mapping) {
         iova0 = mapping->iova + ((uint8_t *)host - (uint8_t *)mapping->host);
@@ -778,7 +778,6 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
         *iova = iova0;
     }
 out:
-    qemu_mutex_unlock(&s->lock);
     return ret;
 }
 
@@ -813,14 +812,12 @@ void qemu_vfio_dma_unmap(QEMUVFIOState *s, void *host)
     }
 
     trace_qemu_vfio_dma_unmap(s, host);
-    qemu_mutex_lock(&s->lock);
+    QEMU_LOCK_GUARD(&s->lock);
     m = qemu_vfio_find_mapping(s, host, &index);
     if (!m) {
-        goto out;
+        return;
     }
     qemu_vfio_undo_mapping(s, m, NULL);
-out:
-    qemu_mutex_unlock(&s->lock);
 }
 
 static void qemu_vfio_reset(QEMUVFIOState *s)
-- 
2.31.1