DGA: Fix ProcXF86DGASetViewPort for missing support in driver.
Fixes a segfault when trying to activate a DGA mode without checking whether DGA modesetting is at all possible.
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@ -93,7 +93,7 @@ ProcXF86DGADirectVideo(ClientPtr client)
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REQUEST_SIZE_MATCH(xXF86DGADirectVideoReq);
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if (!DGAAvailable(stuff->screen))
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if (!DGAAvailable(stuff->screen))
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return DGAErrorBase + XF86DGANoDirectVideoMode;
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if (stuff->enable & XF86DGADirectGraphics) {
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@ -128,7 +128,7 @@ ProcXF86DGAGetViewPortSize(ClientPtr client)
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rep.length = 0;
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rep.sequenceNumber = client->sequence;
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if (!DGAAvailable(stuff->screen))
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if (!DGAAvailable(stuff->screen))
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return (DGAErrorBase + XF86DGANoDirectVideoMode);
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if(!(num = DGAGetOldDGAMode(stuff->screen)))
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@ -153,6 +153,9 @@ ProcXF86DGASetViewPort(ClientPtr client)
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REQUEST_SIZE_MATCH(xXF86DGASetViewPortReq);
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if (!DGAAvailable(stuff->screen))
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return (DGAErrorBase + XF86DGANoDirectVideoMode);
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if (!DGAActive(stuff->screen))
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{
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int num;
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