linux-kernel - [PATCH v2 4/5] drm/v3d: Drop reservation of a shared slot in the dma-buf reservations.

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Date:   Tue, 16 Apr 2019 15:58:55 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        david.emett@...adcom.com, thomas.spurden@...adcom.com,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH v2 4/5] drm/v3d: Drop reservation of a shared slot in the dma-buf reservations.

We only set the excl (possible-writing) fence pointer and never add a
shared (read-only) fence.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 8bd6fa69f566..6873b14a0d38 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -253,18 +253,6 @@ v3d_lock_bo_reservations(struct drm_gem_object **bos,
 	if (ret)
 		return ret;
 
-	/* Reserve space for our shared (read-only) fence references,
-	 * before we commit the CL to the hardware.
-	 */
-	for (i = 0; i < bo_count; i++) {
-		ret = reservation_object_reserve_shared(bos[i]->resv, 1);
-		if (ret) {
-			drm_gem_unlock_reservations(bos, bo_count,
-						    acquire_ctx);
-			return ret;
-		}
-	}
-
 	return 0;
 }
 
-- 
2.20.1