From: Gerd Hoffmann Date: Fri, 18 Jan 2019 12:20:07 +0000 (+0100) Subject: drm/qxl: move qxl_primary_apply_cursor to correct place X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1f85535cd04cb0b135971df9dcfd51749c9783f3;p=linux.git drm/qxl: move qxl_primary_apply_cursor to correct place The qxl device ties the cursor to the primary surface. Therefore calling qxl_io_destroy_primary() and qxl_io_create_primary() to switch the framebuffer causes the cursor information being lost and the driver must re-apply it. The correct call order to do that is qxl_io_destroy_primary() + qxl_io_create_primary() + qxl_primary_apply_cursor(). The old code did qxl_io_destroy_primary() + qxl_primary_apply_cursor() + qxl_io_create_primary(). Due to qxl_primary_apply_cursor request being queued in a ringbuffer and qxl_io_create_primary() trapping to the hypervisor instantly there is a high chance that qxl_io_create_primary() is processed first even with the wrong call order. But it's racy and thus not reliable. Signed-off-by: Gerd Hoffmann Acked-by: Noralf Trønnes Link: http://patchwork.freedesktop.org/patch/msgid/20190118122020.27596-11-kraxel@redhat.com --- diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c index c4dd71a80c2fa..6180b4a714b6f 100644 --- a/drivers/gpu/drm/qxl/qxl_display.c +++ b/drivers/gpu/drm/qxl/qxl_display.c @@ -533,7 +533,6 @@ static void qxl_primary_atomic_update(struct drm_plane *plane, .x2 = plane->state->fb->width, .y2 = plane->state->fb->height }; - int ret; bool same_shadow = false; if (old_state->fb) { @@ -554,16 +553,13 @@ static void qxl_primary_atomic_update(struct drm_plane *plane, if (!same_shadow) qxl_io_destroy_primary(qdev); bo_old->is_primary = false; - - ret = qxl_primary_apply_cursor(plane); - if (ret) - DRM_ERROR( - "could not set cursor after creating primary"); } if (!bo->is_primary) { - if (!same_shadow) + if (!same_shadow) { qxl_io_create_primary(qdev, 0, bo); + qxl_primary_apply_cursor(plane); + } bo->is_primary = true; }