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authorEric Anholt <eric@anholt.net>2008-09-23 10:48:39 -0700
committerEric Anholt <eric@anholt.net>2008-09-23 17:10:04 -0700
commit0dccf017ab629d69fce91e18b013882ecb45f55d (patch)
tree12fbf92d5b9d896f23fb7df4396d4a64dcd0241a /bsd-core/mga/Makefile
parent1b3abe62b5751d0514d57aa850e584dca7dfc23e (diff)
intel: Replace wraparound test logic in bufmgr_fake. Again.
I'd swapped the operands, so if we weren't in lockstep with the hardware we said the sequence was always passed. Additionally, a race was available that we might have failed at recovering from. Instead, I've replaced the logic with new stuff that should be more robust and not rely on all the parties in userland following the same IRQ_EMIT() == 1 protocol. Also, in a radical departure from past efforts, include a long comment describing the failure modes and how we're working around them. Thanks to haihao for catching the original issue.
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