drm/i915/gvt: fix error return check for copy_gma_to_hva()

From commit 73dec95e6ba3 ("drm/i915: Emit to ringbuffer directly"),
copy_gma_to_hva() now returns copied data length instead of 0, so
need to change error return check for that.

Note: Looks this is caused by backmerge conflict resolving, so
4.11-rc4 is not impacted as commit 73dec95e6ba3 ("drm/i915: Emit to
ringbuffer directly") is not in 4.11. But need to fix this before I
can apply 4.12 stuff against drm-intel-next correctly.

Fixes: e5c1ff14757a ("Backmerge tag 'v4.11-rc4' into drm-next")
Cc: Dave Airlie <airlied@redhat.com>
Cc: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index b3c9a478c656..6f972afbdbc3 100644
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -1673,7 +1673,7 @@ static int perform_bb_shadow(struct parser_exec_state *s)
         ret = copy_gma_to_hva(s->vgpu, s->vgpu->gtt.ggtt_mm,
                               gma, gma + bb_size,
                               dst);
-        if (ret) {
+        if (ret < 0) {
                 gvt_vgpu_err("fail to copy guest ring buffer\n");
                 goto unmap_src;
         }
@@ -2666,7 +2666,7 @@ static int shadow_workload_ring_buffer(struct intel_vgpu_workload *workload)
         if (gma_head > gma_tail) {
                 ret = copy_gma_to_hva(vgpu, vgpu->gtt.ggtt_mm,
                                       gma_head, gma_top, cs);
-                if (ret) {
+                if (ret < 0) {
                         gvt_vgpu_err("fail to copy guest ring buffer\n");
                         return ret;
                 }
@@ -2676,7 +2676,7 @@ static int shadow_workload_ring_buffer(struct intel_vgpu_workload *workload)
 
         /* copy head or start <-> tail */
         ret = copy_gma_to_hva(vgpu, vgpu->gtt.ggtt_mm, gma_head, gma_tail, cs);
-        if (ret) {
+        if (ret < 0) {
                 gvt_vgpu_err("fail to copy guest ring buffer\n");
                 return ret;
         }
@@ -2737,7 +2737,7 @@ static int shadow_indirect_ctx(struct intel_shadow_wa_ctx *wa_ctx)
                                 wa_ctx->workload->vgpu->gtt.ggtt_mm,
                                 guest_gma, guest_gma + ctx_size,
                                 map);
-        if (ret) {
+        if (ret < 0) {
                 gvt_vgpu_err("fail to copy guest indirect ctx\n");
                 goto unmap_src;
         }