[PATCH v4 02/15] util: vfio-helpers: Remove Error parameter from qemu_vfio_undo_mapping()

[David Hildenbrand <david@redhat.com>]

Everybody discards the error. Let's error_report() instead so this error
doesn't get lost.

This is now the same error handling as in qemu_vfio_do_mapping(). However,
we don't report any errors via the return value to the caller. This seems
to be one of these "will never happen, but let's better print an error
because the caller can't handle it either way" cases.

Cc: Richard Henderson <rth@twiddle.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 util/vfio-helpers.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index f31aa77ffe..7085ca702c 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -541,8 +541,7 @@ static int qemu_vfio_do_mapping(QEMUVFIOState *s, void *host, size_t size,
 /**
  * Undo the DMA mapping from @s with VFIO, and remove from mapping list.
  */
-static void qemu_vfio_undo_mapping(QEMUVFIOState *s, IOVAMapping *mapping,
-                                   Error **errp)
+static void qemu_vfio_undo_mapping(QEMUVFIOState *s, IOVAMapping *mapping)
 {
     int index;
     struct vfio_iommu_type1_dma_unmap unmap = {
@@ -557,7 +556,7 @@ static void qemu_vfio_undo_mapping(QEMUVFIOState *s, IOVAMapping *mapping,
     assert(QEMU_IS_ALIGNED(mapping->size, qemu_real_host_page_size));
     assert(index >= 0 && index < s->nr_mappings);
     if (ioctl(s->container, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
-        error_setg_errno(errp, errno, "VFIO_UNMAP_DMA failed");
+        error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
     }
     memmove(mapping, &s->mappings[index + 1],
             sizeof(s->mappings[0]) * (s->nr_mappings - index - 1));
@@ -622,7 +621,7 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
             assert(qemu_vfio_verify_mappings(s));
             ret = qemu_vfio_do_mapping(s, host, size, iova0);
             if (ret) {
-                qemu_vfio_undo_mapping(s, mapping, NULL);
+                qemu_vfio_undo_mapping(s, mapping);
                 goto out;
             }
             s->low_water_mark += size;
@@ -682,7 +681,7 @@ void qemu_vfio_dma_unmap(QEMUVFIOState *s, void *host)
     if (!m) {
         goto out;
     }
-    qemu_vfio_undo_mapping(s, m, NULL);
+    qemu_vfio_undo_mapping(s, m);
 out:
     qemu_mutex_unlock(&s->lock);
 }
@@ -699,7 +698,7 @@ void qemu_vfio_close(QEMUVFIOState *s)
         return;
     }
     while (s->nr_mappings) {
-        qemu_vfio_undo_mapping(s, &s->mappings[s->nr_mappings - 1], NULL);
+        qemu_vfio_undo_mapping(s, &s->mappings[s->nr_mappings - 1]);
     }
     ram_block_notifier_remove(&s->ram_notifier);
     qemu_vfio_reset(s);
-- 
2.24.1