[PATCH v3 07/21] xen/drm: switch xen_drm_front to use INVALID_GRANT_REF

Juergen Gross
2022-05-05T08:19:59Z

Instead of using a private macro for an invalid grant reference use
the common one.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/gpu/drm/xen/xen_drm_front.h | 9 ---------
drivers/gpu/drm/xen/xen_drm_front_evtchnl.c | 4 ++--
2 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front.h b/drivers/gpu/drm/xen/xen_drm_front.h
index cefafe859aba..a987c78abe41 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.h
+++ b/drivers/gpu/drm/xen/xen_drm_front.h
@@ -80,15 +80,6 @@ struct drm_pending_vblank_event;
/* timeout in ms to wait for backend to respond */
#define XEN_DRM_FRONT_WAIT_BACK_MS 3000

-#ifndef GRANT_INVALID_REF
-/*
- * Note on usage of grant reference 0 as invalid grant reference:
- * grant reference 0 is valid, but never exposed to a PV driver,
- * because of the fact it is already in use/reserved by the PV console.
- */
-#define GRANT_INVALID_REF 0
-#endif
-
struct xen_drm_front_info {
struct xenbus_device *xb_dev;
struct xen_drm_front_drm_info *drm_info;
diff --git a/drivers/gpu/drm/xen/xen_drm_front_evtchnl.c b/drivers/gpu/drm/xen/xen_drm_front_evtchnl.c
index 08b526eeec16..4006568b9e32 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_evtchnl.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_evtchnl.c
@@ -147,7 +147,7 @@ static void evtchnl_free(struct xen_drm_front_info *front_info,
xenbus_free_evtchn(front_info->xb_dev, evtchnl->port);

/* end access and free the page */
- if (evtchnl->gref != GRANT_INVALID_REF)
+ if (evtchnl->gref != INVALID_GRANT_REF)
gnttab_end_foreign_access(evtchnl->gref, page);

memset(evtchnl, 0, sizeof(*evtchnl));
@@ -168,7 +168,7 @@ static int evtchnl_alloc(struct xen_drm_front_info *front_info, int index,
evtchnl->index = index;
evtchnl->front_info = front_info;
evtchnl->state = EVTCHNL_STATE_DISCONNECTED;
- evtchnl->gref = GRANT_INVALID_REF;
+ evtchnl->gref = INVALID_GRANT_REF;

page = get_zeroed_page(GFP_NOIO | __GFP_HIGH);
if (!page) {
--
2.35.3