Commit 216fcd29 authored by Kenji Kaneshige's avatar Kenji Kaneshige Committed by Tony Luck

[IA64] Fix possible race in destroy_and_reserve_irq()

Currently, destroy_and_reserve_irq() sets irq_status[irq] UNUSED using
clear_irq_vector() and sets irq_status[irq] RSVD using reserve_irq().
But there is a race window because vector_lock is once released between
them. This patch fixes this race window.
Signed-off-by: default avatarKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent c4c376f7
......@@ -101,15 +101,6 @@ int check_irq_used(int irq)
return -1;
}
static void reserve_irq(unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&vector_lock, flags);
irq_status[irq] = IRQ_RSVD;
spin_unlock_irqrestore(&vector_lock, flags);
}
static inline int find_unassigned_irq(void)
{
int irq;
......@@ -302,10 +293,14 @@ static cpumask_t vector_allocation_domain(int cpu)
void destroy_and_reserve_irq(unsigned int irq)
{
unsigned long flags;
dynamic_irq_cleanup(irq);
clear_irq_vector(irq);
reserve_irq(irq);
spin_lock_irqsave(&vector_lock, flags);
__clear_irq_vector(irq);
irq_status[irq] = IRQ_RSVD;
spin_unlock_irqrestore(&vector_lock, flags);
}
static int __reassign_irq_vector(int irq, int cpu)
......
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