linux-kernel - [PATCH 3/3] drm/v3d: Add a note about locking of v3d_fence

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Message-Id: <20180605190302.18279-3-eric@anholt.net>
Date:   Tue,  5 Jun 2018 12:03:02 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, Lucas Stach <l.stach@...gutronix.de>,
        amd-gfx@...ts.freedesktop.org, Eric Anholt <eric@...olt.net>
Subject: [PATCH 3/3] drm/v3d: Add a note about locking of v3d_fence_create().

This isn't the first time I've had to argue to myself why the '++' was
safe.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/v3d/v3d_fence.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/v3d/v3d_fence.c b/drivers/gpu/drm/v3d/v3d_fence.c
index bfe31a89668b..6265e9ab4a13 100644
--- a/drivers/gpu/drm/v3d/v3d_fence.c
+++ b/drivers/gpu/drm/v3d/v3d_fence.c
@@ -3,6 +3,9 @@
 
 #include "v3d_drv.h"
 
+/* Note that V3D fences are created during v3d_job_run(), so we're
+ * already implictly locked.
+ */
 struct dma_fence *v3d_fence_create(struct v3d_dev *v3d, enum v3d_queue queue)
 {
 	struct v3d_fence *fence;
-- 
2.17.0