nvc0: fix a crash on context destruction

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

diff --git a/src/gallium/drivers/nvc0/nvc0_context.c b/src/gallium/drivers/nvc0/nvc0_context.c
index d5dcf1fb0280dc1d6a781b1a8a91f6e8cf5e736c..d6de979b132d0f46ee2a45621ef2a9c14f9cce18 100644 (file)
--- a/src/gallium/drivers/nvc0/nvc0_context.c
+++ b/src/gallium/drivers/nvc0/nvc0_context.c
@@ -62,8 +62,10 @@ nvc0_destroy(struct pipe_context *pipe)
 
    draw_destroy(nvc0->draw);
 
-   if (nvc0->screen->cur_ctx == nvc0)
+   if (nvc0->screen->cur_ctx == nvc0) {
+      nvc0->screen->base.channel->user_private = NULL;
       nvc0->screen->cur_ctx = NULL;
+   }
 
    FREE(nvc0);
 }
@@ -73,8 +75,10 @@ nvc0_default_flush_notify(struct nouveau_channel *chan)
 {
    struct nvc0_context *nvc0 = chan->user_private;
 
-   nouveau_fence_update(&nvc0->screen->base, TRUE);
+   if (!nvc0)
+      return;
 
+   nouveau_fence_update(&nvc0->screen->base, TRUE);
    nouveau_fence_next(&nvc0->screen->base);
 }