ide__sti usage

[Zwane Mwaikambo]

Hi Bart, Martin
	I'm seeing a number of deadlocks, most of them due to ide__sti 
enabling interrupts in a critical section which needs to be protected 
against interrupts too.

Another dangerous scenario is the following, from here the usage of 
ide__sti becomes questionable.

queue_commands() {
	ide__sti();
	start_request();
}
...
start_request() {
	spin_unlock_irq();
	frob_ide();
	spin_lock_irq();
}

and also;

if (ch->unmask)
	ide__sti();	/* local CPU only */

/* service this interrupt, may set handler for next interrupt */
startstop = handler(drive, drive->rq);
spin_lock_irq(ch->lock);

If someone can explain to me what ide__sti really is trying to achieve 
i'd greatly appreciate it.

Regards,
	Zwane Mwaikambo

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