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genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value 

irq_move_masked_irq() checks the return code of
chip->irq_set_affinity() only for 0, but IRQ_SET_MASK_OK_NOCOPY is
also a valid return code, which is there to avoid a redundant copy of
the cpumask. But in case of IRQ_SET_MASK_OK_NOCOPY we not only avoid
the redundant copy, we also fail to adjust the thread affinity of an
eventually threaded interrupt handler.

Handle IRQ_SET_MASK_OK (==0) and IRQ_SET_MASK_OK_NOCOPY(==1) return
values correctly by checking the valid return values seperately.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Keping Chen <chenkeping@huawei.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1333120296-13563-2-git-send-email-jiang.liu@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2012-03-30 23:11:33 +08:00 committed by Thomas Gleixner
parent 241fc640be
commit f5cb92ac82
1 changed files with 7 additions and 3 deletions
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10
kernel/irq/migration.c
View File

@ -43,12 +43,16 @@ void irq_move_masked_irq(struct irq_data *idata)
* masking the irqs. * masking the irqs.
*/ */
if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask) if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
< nr_cpu_ids)) < nr_cpu_ids)) {
if (!chip->irq_set_affinity(&desc->irq_data, int ret = chip->irq_set_affinity(&desc->irq_data,
desc->pending_mask, false)) { desc->pending_mask, false);
switch (ret) {
case IRQ_SET_MASK_OK:
cpumask_copy(desc->irq_data.affinity, desc->pending_mask); cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
case IRQ_SET_MASK_OK_NOCOPY:
irq_set_thread_affinity(desc); irq_set_thread_affinity(desc);
} }
}
cpumask_clear(desc->pending_mask); cpumask_clear(desc->pending_mask);
} }