drm/nouveau: use dma.max rather than pushbuf size for checking GET validity

Some upcoming G80 DMA changes will depend on this, but it's split out for
bisectibility just in case it causes some unexpected issues.

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_dma.c b/drivers/gpu/drm/nouveau/nouveau_dma.c
index f1fd3f2b9813c322115b55a5368ee57155a1c5c1..3f7f78e03d4223ff2ad9aaaed4184e17b3a44cbe 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_dma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dma.c
@@ -130,7 +130,7 @@ READ_GET(struct nouveau_channel *chan, uint32_t *get)
 
        val = nvchan_rd32(chan, chan->user_get);
        if (val < chan->pushbuf_base ||
-           val >= chan->pushbuf_base + chan->pushbuf_bo->bo.mem.size) {
+           val > chan->pushbuf_base + (chan->dma.max << 2)) {
                /* meaningless to dma_wait() except to know whether the
                 * GPU has stalled or not
                 */