virtio: use size-based config accessors.

This lets the transport do endian conversion if necessary, and insulates
the drivers from the difference.

Most drivers can use the simple helpers virtio_cread() and virtio_cwrite().

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 8 deletions

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 2a110391f8ce..e6bb2352df40 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -710,19 +710,15 @@ static struct scsi_host_template virtscsi_host_template_multi = {
 #define virtscsi_config_get(vdev, fld) \
         ({ \
                 typeof(((struct virtio_scsi_config *)0)->fld) __val; \
-                vdev->config->get(vdev, \
-                                  offsetof(struct virtio_scsi_config, fld), \
-                                  &__val, sizeof(__val)); \
+                virtio_cread(vdev, struct virtio_scsi_config, fld, &__val); \
                 __val; \
         })
 
 #define virtscsi_config_set(vdev, fld, val) \
-        (void)({ \
+        do { \
                 typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \
-                vdev->config->set(vdev, \
-                                  offsetof(struct virtio_scsi_config, fld), \
-                                  &__val, sizeof(__val)); \
-        })
+                virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \
+        } while(0)
 
 static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity)
 {