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sparc32, leon: Check for existent irq_map entry in leon_handle_ext_irq
If an irq is being unlinked concurrently with leon_handle_ext_irq, irq_map[eirq] might be null in leon_handle_ext_irq. Make sure that this is not dereferenced. Signed-off-by: Andreas Larsson <andreas@gaisler.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 4 additions and 2 deletions
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@ -56,11 +56,13 @@ static inline unsigned int leon_eirq_get(int cpu)
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static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
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static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
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{
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{
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unsigned int eirq;
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unsigned int eirq;
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struct irq_bucket *p;
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int cpu = sparc_leon3_cpuid();
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int cpu = sparc_leon3_cpuid();
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eirq = leon_eirq_get(cpu);
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eirq = leon_eirq_get(cpu);
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if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
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p = irq_map[eirq];
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generic_handle_irq(irq_map[eirq]->irq);
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if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */
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generic_handle_irq(p->irq);
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}
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}
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/* The extended IRQ controller has been found, this function registers it */
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/* The extended IRQ controller has been found, this function registers it */
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