drm: qxl: Consolidate bo reservation when pinning

Every attempt to pin/unpin objects in memory requires
qxl_bo_reserve/unreserve calls around the pinning operation to protect
the object from concurrent access, which causes that call sequence to be
reproduced every place where pinning is needed.  In some cases, that
sequence was not executed correctly, resulting in potential unprotected
pinning operations.

This commit encapsulates the reservation inside a new wrapper to make
sure it is always handled properly.  In cases where reservation must be
done beforehand, for some reason, one can use the unprotected version
__qxl_bo_pin/unpin.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227204328.18761-3-krisman@collabora.co.uk
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/qxl/qxl_fb.c

@@ -90,14 +90,10 @@ static struct fb_ops qxlfb_ops = {
 static void qxlfb_destroy_pinned_object(struct drm_gem_object *gobj)
 {
 	struct qxl_bo *qbo = gem_to_qxl_bo(gobj);
-	int ret;
 
-	ret = qxl_bo_reserve(qbo, false);
-	if (likely(ret == 0)) {
-		qxl_bo_kunmap(qbo);
-		qxl_bo_unpin(qbo);
-		qxl_bo_unreserve(qbo);
-	}
+	qxl_bo_kunmap(qbo);
+	qxl_bo_unpin(qbo);
+
 	drm_gem_object_unreference_unlocked(gobj);
 }
 
@@ -148,16 +144,13 @@ static int qxlfb_create_pinned_object(struct qxl_fbdev *qfbdev,
 	qbo->surf.height = mode_cmd->height;
 	qbo->surf.stride = mode_cmd->pitches[0];
 	qbo->surf.format = SPICE_SURFACE_FMT_32_xRGB;
-	ret = qxl_bo_reserve(qbo, false);
-	if (unlikely(ret != 0))
-		goto out_unref;
+
 	ret = qxl_bo_pin(qbo, QXL_GEM_DOMAIN_SURFACE, NULL);
 	if (ret) {
-		qxl_bo_unreserve(qbo);
 		goto out_unref;
 	}
 	ret = qxl_bo_kmap(qbo, NULL);
-	qxl_bo_unreserve(qbo); /* unreserve, will be mmaped */
+
 	if (ret)
 		goto out_unref;
 
@@ -322,12 +315,8 @@ static int qxlfb_create(struct qxl_fbdev *qfbdev,
 
 out_unref:
 	if (qbo) {
-		ret = qxl_bo_reserve(qbo, false);
-		if (likely(ret == 0)) {
-			qxl_bo_kunmap(qbo);
-			qxl_bo_unpin(qbo);
-			qxl_bo_unreserve(qbo);
-		}
+		qxl_bo_kunmap(qbo);
+		qxl_bo_unpin(qbo);
 	}
 	if (fb && ret) {
 		drm_gem_object_unreference_unlocked(gobj);