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e2971bdab2
dev_priv keeps track of the current addressing mode that gets set at execbuffer time. Unfortunately the existing code was doing this before acquiring struct_mutex which leaves a race with another thread also doing an execbuffer. If that wasn't bad enough, relocate_slow drops struct_mutex which opens a much more likely error where another thread comes in and modifies the state while relocate_slow is being slow. The solution here is to just defer setting this state until we absolutely need it, and we know we'll have struct_mutex for the remainder of our code path. v2: Keith noticed a bug in the original patch. Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Keith Packard <keithp@keithp.com> |
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