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authorLinus Torvalds <torvalds@linux-foundation.org>2011-02-03 09:17:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-03 09:17:41 -0800
commitaba99437f5af7a419a82438f7fab16bb3ddd9b44 (patch)
treeb3b36b2d1c4b462519292f8c56dd2098ede637a1 /kernel
parent49abda98929a100cd6309da8dca29db84c72c721 (diff)
parentf1a06390d013244e721372b3f9b66e39b6429c71 (diff)
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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
* '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
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/migration.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 1d25419..441fd62 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -56,6 +56,7 @@ void move_masked_irq(int irq)
void move_native_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
+ bool masked;
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
@@ -63,8 +64,15 @@ void move_native_irq(int irq)
if (unlikely(desc->status & IRQ_DISABLED))
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);
- desc->irq_data.chip->irq_unmask(&desc->irq_data);
+ if (!masked)
+ desc->irq_data.chip->irq_unmask(&desc->irq_data);
}
-