[PATCH] Memory Barriers on cosa wan driver

	Hi Jeff,

	Patch against 2.6.0-test6. Adds a few needed memory barriers before schedule_timeout, kills setting current task to TASK_RUNNING after schedule_timeout and uses the __set_current_state functions instead of current->state = TASK_RUNNING.

	I don't have the hardware, so I couldn't test it. But it looks right :)

	Please review and consider applying if it is ok.

	Thanks,

Felipe
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