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powerpc/mpic: Fix problem that affinity is not updated 

Since commit 57b150cce8, desc->affinity
of an irq is changed after calling desc->chip->set_affinity.
Therefore we need to fix the irq_choose_cpu() not to depend on the
desc->affinity for new mask.

Signed-off-by: Jiajun Wu <b06378@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Yang Li 2009-12-16 20:18:11 +00:00 committed by Benjamin Herrenschmidt
parent a1128f8f0f
commit 38e1313fc7
1 changed files with 6 additions and 13 deletions
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19
arch/powerpc/sysdev/mpic.c
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@ -567,13 +567,11 @@ static void __init mpic_scan_ht_pics(struct mpic *mpic)
#endif /* CONFIG_MPIC_U3_HT_IRQS */
#ifdef CONFIG_SMP
static int irq_choose_cpu(unsigned int virt_irq)
static int irq_choose_cpu(const cpumask_t *mask)
{
cpumask_t mask;
int cpuid;
cpumask_copy(&mask, irq_to_desc(virt_irq)->affinity);
if (cpus_equal(mask, CPU_MASK_ALL)) {
if (cpumask_equal(mask, cpu_all_mask)) {
static int irq_rover;
static DEFINE_SPINLOCK(irq_rover_lock);
unsigned long flags;
@ -594,20 +592,15 @@ static int irq_choose_cpu(unsigned int virt_irq)
spin_unlock_irqrestore(&irq_rover_lock, flags);
} else {
cpumask_t tmp;
cpus_and(tmp, cpu_online_map, mask);
if (cpus_empty(tmp))
cpuid = cpumask_first_and(mask, cpu_online_mask);
if (cpuid >= nr_cpu_ids)
goto do_round_robin;
cpuid = first_cpu(tmp);
}
return get_hard_smp_processor_id(cpuid);
}
#else
static int irq_choose_cpu(unsigned int virt_irq)
static int irq_choose_cpu(const cpumask_t *mask)
{
return hard_smp_processor_id();
}
@ -816,7 +809,7 @@ int mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
unsigned int src = mpic_irq_to_hw(irq);
if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
int cpuid = irq_choose_cpu(irq);
int cpuid = irq_choose_cpu(cpumask);
mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
} else {