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

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
index 9151919..56192a7 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
@@ -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