Matrox Mystique: Bus-mastering fixes #3903
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* Make all bus-mastering-related variables atomic * Do not, under any circumstances, attempt to read beyond PRIMEND and SECEND This allows NT 4.0's Mystique drivers to work with busmastering enabled.
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Summary
Fixes bus-mastering problems under Matrox Mystique.
This allows NT 4.0's Matrox Mystique drivers to work with busmastering options enabled. I'm yet to check Windows 9x drivers.
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