drm/nouveau: Avoid race in the interchannel sync code.
It needs a "strong" channel reference because it actually writes to the channel pushbuf, otherwise the corresponding FIFO context could get kicked off in the middle of nouveau_fence_sync(). Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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