[PATCH xf86-video-ati] Add explicit RADEON_DRM_QUEUE_ERROR define

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

Should make the radeon_drm_queue_alloc error handling clearer, and gets
rid of a compile warning about it returning NULL.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 src/drmmode_display.c  | 2 +-
 src/radeon_dri2.c      | 4 ++--
 src/radeon_drm_queue.c | 7 ++++---
 src/radeon_drm_queue.h | 2 ++
 src/radeon_kms.c       | 4 ++--
 src/radeon_present.c   | 2 +-
 6 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 50de0be..d3af20d 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -2812,7 +2812,7 @@ Bool radeon_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
 						       flipdata,
 						       drmmode_flip_handler,
 						       drmmode_flip_abort);
-		if (!drm_queue_seq) {
+		if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
 			xf86DrvMsg(scrn->scrnIndex, X_WARNING,
 				   "Allocating DRM queue event entry failed.\n");
 			goto error;
diff --git a/src/radeon_dri2.c b/src/radeon_dri2.c
index 62325bd..c55e6ee 100644
--- a/src/radeon_dri2.c
+++ b/src/radeon_dri2.c
@@ -1201,7 +1201,7 @@ static int radeon_dri2_schedule_wait_msc(ClientPtr client, DrawablePtr draw,
     drm_queue_seq = radeon_drm_queue_alloc(crtc, client, RADEON_DRM_QUEUE_ID_DEFAULT,
 					   wait_info, radeon_dri2_frame_event_handler,
 					   radeon_dri2_frame_event_abort);
-    if (!drm_queue_seq) {
+    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
         xf86DrvMsg(scrn->scrnIndex, X_WARNING,
 		   "Allocating DRM queue event entry failed.\n");
         goto out_complete;
@@ -1348,7 +1348,7 @@ static int radeon_dri2_schedule_swap(ClientPtr client, DrawablePtr draw,
     drm_queue_seq = radeon_drm_queue_alloc(crtc, client, RADEON_DRM_QUEUE_ID_DEFAULT,
 					   swap_info, radeon_dri2_frame_event_handler,
 					   radeon_dri2_frame_event_abort);
-    if (!drm_queue_seq) {
+    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
         xf86DrvMsg(scrn->scrnIndex, X_WARNING,
 		   "Allocating DRM queue entry failed.\n");
         goto blit_fallback;
diff --git a/src/radeon_drm_queue.c b/src/radeon_drm_queue.c
index 0d999dd..31f2435 100644
--- a/src/radeon_drm_queue.c
+++ b/src/radeon_drm_queue.c
@@ -92,10 +92,11 @@ radeon_drm_queue_alloc(xf86CrtcPtr crtc, ClientPtr client,
 
     e = calloc(1, sizeof(struct radeon_drm_queue_entry));
     if (!e)
-	return NULL;
+	return RADEON_DRM_QUEUE_ERROR;
+
+    if (_X_UNLIKELY(radeon_drm_queue_seq == RADEON_DRM_QUEUE_ERROR))
+	radeon_drm_queue_seq++;
 
-    if (!radeon_drm_queue_seq)
-	radeon_drm_queue_seq = 1;
     e->seq = radeon_drm_queue_seq++;
     e->client = client;
     e->crtc = crtc;
diff --git a/src/radeon_drm_queue.h b/src/radeon_drm_queue.h
index 0d9d278..c3e2076 100644
--- a/src/radeon_drm_queue.h
+++ b/src/radeon_drm_queue.h
@@ -29,6 +29,8 @@
 #ifndef _RADEON_DRM_QUEUE_H_
 #define _RADEON_DRM_QUEUE_H_
 
+#define RADEON_DRM_QUEUE_ERROR 0
+
 #define RADEON_DRM_QUEUE_CLIENT_DEFAULT serverClient
 #define RADEON_DRM_QUEUE_ID_DEFAULT ~0ULL
 
diff --git a/src/radeon_kms.c b/src/radeon_kms.c
index 20388e8..a8af160 100644
--- a/src/radeon_kms.c
+++ b/src/radeon_kms.c
@@ -529,7 +529,7 @@ radeon_scanout_update(xf86CrtcPtr xf86_crtc)
 					   drmmode_crtc,
 					   radeon_scanout_update_handler,
 					   radeon_scanout_update_abort);
-    if (!drm_queue_seq) {
+    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
 	xf86DrvMsg(scrn->scrnIndex, X_WARNING,
 		   "radeon_drm_queue_alloc failed for scanout update\n");
 	return;
@@ -581,7 +581,7 @@ radeon_scanout_flip(ScreenPtr pScreen, RADEONInfoPtr info,
 					   RADEON_DRM_QUEUE_ID_DEFAULT,
 					   drmmode_crtc, NULL,
 					   radeon_scanout_flip_abort);
-    if (!drm_queue_seq) {
+    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
 	xf86DrvMsg(scrn->scrnIndex, X_WARNING,
 		   "Allocating DRM event queue entry failed.\n");
 	return;
diff --git a/src/radeon_present.c b/src/radeon_present.c
index 69a0532..93c18a8 100644
--- a/src/radeon_present.c
+++ b/src/radeon_present.c
@@ -169,7 +169,7 @@ radeon_present_queue_vblank(RRCrtcPtr crtc, uint64_t event_id, uint64_t msc)
 					   event_id, event,
 					   radeon_present_vblank_handler,
 					   radeon_present_vblank_abort);
-    if (!drm_queue_seq) {
+    if (drm_queue_seq == RADEON_DRM_QUEUE_ERROR) {
 	free(event);
 	return BadAlloc;
     }
-- 
2.8.1