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Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  genirq: Prevent irq storm on migration
This commit is contained in:
Linus Torvalds 2011-02-03 09:17:41 -08:00
commit aba99437f5
1 changed files with 11 additions and 3 deletions
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14
kernel/irq/migration.c
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@ -56,6 +56,7 @@ void move_masked_irq(int irq)
void move_native_irq(int irq) void move_native_irq(int irq)
{ {
struct irq_desc *desc = irq_to_desc(irq); struct irq_desc *desc = irq_to_desc(irq);
bool masked;
if (likely(!(desc->status & IRQ_MOVE_PENDING))) if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return; return;
@ -63,8 +64,15 @@ void move_native_irq(int irq)
if (unlikely(desc->status & IRQ_DISABLED)) if (unlikely(desc->status & IRQ_DISABLED))
return; return;
desc->irq_data.chip->irq_mask(&desc->irq_data); /*
* Be careful vs. already masked interrupts. If this is a
* threaded interrupt with ONESHOT set, we can end up with an
* interrupt storm.
*/
masked = desc->status & IRQ_MASKED;
if (!masked)
desc->irq_data.chip->irq_mask(&desc->irq_data);
move_masked_irq(irq); move_masked_irq(irq);
desc->irq_data.chip->irq_unmask(&desc->irq_data); if (!masked)
desc->irq_data.chip->irq_unmask(&desc->irq_data);
} }