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Subject[PATCH][PPC32] Don't synchronize in disable_irq() if no handler
This patch is the ppc32 counterpart to a fix that went into
arch/i386/kernel/irq.c last October. The bug was noted by Al Viro: if
no handler exists, and we have IRQ_INPROGRESS set because of an
earlier irq that got through, synchronize_irq() will end up waiting

Signed-off-by: Paul Mackerras <>

diff -urN linux-2.5/arch/ppc/kernel/irq.c pmac-2.5/arch/ppc/kernel/irq.c
--- linux-2.5/arch/ppc/kernel/irq.c 2004-02-23 12:05:11.000000000 +1100
+++ pmac-2.5/arch/ppc/kernel/irq.c 2004-03-11 16:49:24.000000000 +1100
@@ -304,8 +304,10 @@

void disable_irq(unsigned int irq)
+ irq_desc_t *desc = irq_desc + irq;
- synchronize_irq(irq);
+ if (desc->action)
+ synchronize_irq(irq);

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