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drm/nve0/fifo: prevent races between clients updating playlists 

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
hifive-unleashed-5.1
Ben Skeggs 2013-05-06 13:54:50 +10:00
parent fe6fc096b8
commit c2e3259b7b
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
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@ -94,11 +94,13 @@ nve0_fifo_playlist_update(struct nve0_fifo_priv *priv, u32 engine)
u32 match = (engine << 16) | 0x00000001;
int i, p;
mutex_lock(&nv_subdev(priv)->mutex);
cur = engn->playlist[engn->cur_playlist];
if (unlikely(cur == NULL)) {
int ret = nouveau_gpuobj_new(nv_object(priv), NULL,
0x8000, 0x1000, 0, &cur);
if (ret) {
mutex_unlock(&nv_subdev(priv)->mutex);
nv_error(priv, "playlist alloc failed\n");
return;
}
@ -122,6 +124,7 @@ nve0_fifo_playlist_update(struct nve0_fifo_priv *priv, u32 engine)
nv_wr32(priv, 0x002274, (engine << 20) | (p >> 3));
if (!nv_wait(priv, 0x002284 + (engine * 4), 0x00100000, 0x00000000))
nv_error(priv, "playlist %d update timeout\n", engine);
mutex_unlock(&nv_subdev(priv)->mutex);
}
static int