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drm/nvc0/fifo: prevent races between clients updating playlists

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2013-05-13 10:02:11 +10:00
parent c2e3259b7b
commit fadb171902
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/core/engine/fifo/nvc0.c
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@ -71,6 +71,7 @@ nvc0_fifo_playlist_update(struct nvc0_fifo_priv *priv)
struct nouveau_gpuobj *cur;
int i, p;
mutex_lock(&nv_subdev(priv)->mutex);
cur = priv->playlist[priv->cur_playlist];
priv->cur_playlist = !priv->cur_playlist;
@ -87,6 +88,7 @@ nvc0_fifo_playlist_update(struct nvc0_fifo_priv *priv)
nv_wr32(priv, 0x002274, 0x01f00000 | (p >> 3));
if (!nv_wait(priv, 0x00227c, 0x00100000, 0x00000000))
nv_error(priv, "playlist update failed\n");
mutex_unlock(&nv_subdev(priv)->mutex);
}
static int