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>

diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index f8b6eee..87f60ee 100644 (file)
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -56,11 +56,13 @@ static inline unsigned int leon_eirq_get(int cpu)
 static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
 {
        unsigned int eirq;
+       struct irq_bucket *p;
        int cpu = sparc_leon3_cpuid();
 
        eirq = leon_eirq_get(cpu);
-       if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
-               generic_handle_irq(irq_map[eirq]->irq);
+       p = irq_map[eirq];
+       if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */
+               generic_handle_irq(p->irq);
 }
 
 /* The extended IRQ controller has been found, this function registers it */