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drm/nv50/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 2013-05-14 13:33:56 +10:00
parent 9426eedb26
commit b5096566f6
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/core/engine/fifo/nv50.c
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@ -47,6 +47,7 @@ nv50_fifo_playlist_update(struct nv50_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;
@ -60,6 +61,7 @@ nv50_fifo_playlist_update(struct nv50_fifo_priv *priv)
nv_wr32(priv, 0x0032f4, cur->addr >> 12);
nv_wr32(priv, 0x0032ec, p);
nv_wr32(priv, 0x002500, 0x00000101);
mutex_unlock(&nv_subdev(priv)->mutex);
}
static int