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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2007-07-30 11:56:30 +0900
committerTony Luck <tony.luck@intel.com>2007-07-30 16:30:42 -0700
commit216fcd29af47ab53ffd87e82139fcc4095e34d91 (patch)
tree6dc391ecc05255853d1974feee5d3a36b4ddaa5a /arch/ia64
parentc4c376f7e16deeba8f0542eabcaca19b712e7be1 (diff)
[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: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/irq_ia64.c17
1 files changed, 6 insertions, 11 deletions
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index 9386b955eed..c47c8acc96e 100644
--- a/arch/ia64/kernel/irq_ia64.c
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -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)