irqchip/gic-v3-its: Don't enable interrupts in its_irq_set_vcpu_affinity()

The following call-chain leads to enabling interrupts in a nested interrupt
disabled section:

irq_set_vcpu_affinity()
  irq_get_desc_lock()
     raw_spin_lock_irqsave()   <--- Disable interrupts
  its_irq_set_vcpu_affinity()
     guard(raw_spinlock_irq)   <--- Enables interrupts when leaving the guard()
  irq_put_desc_unlock()        <--- Warns because interrupts are enabled

This was broken in commit b97e8a2, which replaced the original
raw_spin_[un]lock() pair with guard(raw_spinlock_irq).

Fix the issue by using guard(raw_spinlock).

[ tglx: Massaged change log ]

Fixes: b97e8a2 ("irqchip/gic-v3-its: Fix potential race condition in its_vlpi_prop_update()")
Signed-off-by: Tomas Krcka <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Marc Zyngier <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/all/[email protected]

Author: Tomas Krcka

drivers/irqchip/irq-gic-v3-its.c

@@ -2045,7 +2045,7 @@ static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
 	if (!is_v4(its_dev->its))
 		return -EINVAL;
 
-	guard(raw_spinlock_irq)(&its_dev->event_map.vlpi_lock);
+	guard(raw_spinlock)(&its_dev->event_map.vlpi_lock);
 
 	/* Unmap request? */
 	if (!info)