Revert "x86/ioapic: Restore IO-APIC irq_chip retrigger callback"

This reverts commit 020eb3daaba2857b32c4cf4c82f503d6a00a67de.

Gabriel C reports that it causes his machine to not boot, and we haven't
tracked down the reason for it yet. Since the bug it fixes has been
around for a longish time, we're better off reverting the fix for now.

Gabriel says:
"It hangs early and freezes with a lot RCU warnings.

I bisected it down to :

> Ruslan Ruslichenko (1):
> x86/ioapic: Restore IO-APIC irq_chip retrigger callback

Reverting this one fixes the problem for me..

The box is a PRIMERGY TX200 S5 , 2 socket , 2 x E5520 CPU(s) installed"

and Ruslan and Thomas are currently stumped.

Reported-and-bisected-by: Gabriel C <[e-mail]>
Cc: Ruslan Ruslichenko <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: [e-mail] # for the backport of the original commit
Signed-off-by: Linus Torvalds <[e-mail]>

arch/x86/kernel/apic/io_apic.c

···
 	.irq_ack		= irq_chip_ack_parent,
 	.irq_eoi		= ioapic_ack_level,
 	.irq_set_affinity	= ioapic_set_affinity,
-	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
···
 	.irq_ack		= irq_chip_ack_parent,
 	.irq_eoi		= ioapic_ir_ack_level,
 	.irq_set_affinity	= ioapic_set_affinity,
-	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };