drm/nv10: Don't oops if the card wants to switch to a channel with no grctx.
Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -803,7 +803,7 @@ nv10_graph_context_switch(struct drm_device *dev)
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/* Load context for next channel */
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chid = (nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR) >> 20) & 0x1f;
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chan = dev_priv->fifos[chid];
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if (chan)
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if (chan && chan->pgraph_ctx)
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nv10_graph_load_context(chan);
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pgraph->fifo_access(dev, true);
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