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drm/nv50: prevent (IB_PUT == IB_GET) for occurring unless idle

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Should fix a DMA race condition I've never seen myself, but could be
the culprit in some random hangs that have been reported.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-09-30 09:09:42 +10:00
parent cd2fb2e9e0
commit 62841ab726
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/nouveau/nouveau_dma.c
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@ -214,7 +214,7 @@ nv50_dma_push_wait(struct nouveau_channel *chan, int count)
chan->dma.ib_free = get - chan->dma.ib_put;
if (chan->dma.ib_free <= 0)
chan->dma.ib_free += chan->dma.ib_max + 1;
chan->dma.ib_free += chan->dma.ib_max;
}
return 0;