![Jiang Liu](/assets/img/avatar_default.png)
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>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include "internals.h"
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void irq_move_masked_irq(struct irq_data *idata)
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{
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struct irq_desc *desc = irq_data_to_desc(idata);
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struct irq_chip *chip = idata->chip;
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if (likely(!irqd_is_setaffinity_pending(&desc->irq_data)))
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return;
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/*
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* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
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*/
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if (!irqd_can_balance(&desc->irq_data)) {
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WARN_ON(1);
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return;
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}
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irqd_clr_move_pending(&desc->irq_data);
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if (unlikely(cpumask_empty(desc->pending_mask)))
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return;
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if (!chip->irq_set_affinity)
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return;
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assert_raw_spin_locked(&desc->lock);
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/*
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* If there was a valid mask to work with, please
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* do the disable, re-program, enable sequence.
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* This is *not* particularly important for level triggered
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* but in a edge trigger case, we might be setting rte
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* when an active trigger is coming in. This could
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* cause some ioapics to mal-function.
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* Being paranoid i guess!
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*
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* For correct operation this depends on the caller
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* masking the irqs.
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*/
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if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
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< nr_cpu_ids)) {
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int ret = chip->irq_set_affinity(&desc->irq_data,
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desc->pending_mask, false);
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switch (ret) {
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case IRQ_SET_MASK_OK:
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cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
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case IRQ_SET_MASK_OK_NOCOPY:
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irq_set_thread_affinity(desc);
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}
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}
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cpumask_clear(desc->pending_mask);
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}
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void irq_move_irq(struct irq_data *idata)
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{
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bool masked;
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if (likely(!irqd_is_setaffinity_pending(idata)))
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return;
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if (unlikely(irqd_irq_disabled(idata)))
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return;
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/*
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* Be careful vs. already masked interrupts. If this is a
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* threaded interrupt with ONESHOT set, we can end up with an
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* interrupt storm.
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*/
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masked = irqd_irq_masked(idata);
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if (!masked)
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idata->chip->irq_mask(idata);
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irq_move_masked_irq(idata);
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if (!masked)
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idata->chip->irq_unmask(idata);
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}
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