From bb5238177188a49fff2afad6e65d413b2af5a43e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <ckoenig.leichtzumerken@gmail.com>
Date: Fri, 2 Jul 2021 13:16:42 +0200
Subject: drm/msm: always wait for the exclusive fence
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Git-commit: 60f800b2bdfafa350e642c4e77dc646a008f2111
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

Drivers also need to to sync to the exclusive fence when
a shared one is present.

Completely untested since the driver won't even compile on !ARM.

Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210702111642.17259-5-christian.koenig@amd.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/msm/msm_gem.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 1e8a971a86f2..39c35414d7b5 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -812,17 +812,15 @@ int msm_gem_sync_object(struct drm_gem_object *obj,
 	struct dma_fence *fence;
 	int i, ret;
 
-	fobj = dma_resv_shared_list(obj->resv);
-	if (!fobj || (fobj->shared_count == 0)) {
-		fence = dma_resv_excl_fence(obj->resv);
-		/* don't need to wait on our own fences, since ring is fifo */
-		if (fence && (fence->context != fctx->context)) {
-			ret = dma_fence_wait(fence, true);
-			if (ret)
-				return ret;
-		}
+	fence = dma_resv_excl_fence(obj->resv);
+	/* don't need to wait on our own fences, since ring is fifo */
+	if (fence && (fence->context != fctx->context)) {
+		ret = dma_fence_wait(fence, true);
+		if (ret)
+			return ret;
 	}
 
+	fobj = dma_resv_shared_list(obj->resv);
 	if (!exclusive || !fobj)
 		return 0;
 
-- 
2.38.1