summaryrefslogtreecommitdiff
path: root/arch/sparc
diff options
context:
space:
mode:
authorAndreas Larsson <andreas@gaisler.com>2012-10-30 00:09:46 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-09 16:30:50 -0800
commit20424d85f8a07090fd32c6fad343f91b63c730b0 (patch)
tree20a92b00fb42b3f848cbf3ab38d97967db5a0eb8 /arch/sparc
parent5cf8f7db8274f68b180ad277dbb0308e72b66efd (diff)
downloadlinux-20424d85f8a07090fd32c6fad343f91b63c730b0.tar.gz
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>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/kernel/leon_kernel.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index f8b6eee40bde..87f60ee65433 100644
--- 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 */