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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-07-21 14:00:57 (GMT)
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-07-21 14:04:17 (GMT)
commit5dfc54e087c15f823ee9b6541d2f0f314e69cbed (patch)
tree845cabe598342a9dea2b77dafef629961ee0c89c /arch/arm/common
parent2ef75701d1711a1feee2a82b42a2597ddc05f88b (diff)
downloadlinux-5dfc54e087c15f823ee9b6541d2f0f314e69cbed.tar.xz
ARM: GIC: avoid routing interrupts to offline CPUs
The irq_set_affinity() method can be called with masks which include offline CPUs. This allows offline CPUs to have interrupts routed to them by writing to /proc/irq/*/smp_affinity after hotplug has taken a CPU offline. Fix this by ensuring that we select a target CPU present in both the required affinity and the online CPU mask. Ensure that we return IRQ_SET_MASK_OK (which happens to be 0) on success to ensure generic code copies the new mask into the irq_data structure. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/common')
-rw-r--r--arch/arm/common/gic.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 635d985..7bdd917 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -179,10 +179,10 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
{
void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
unsigned int shift = (d->irq % 4) * 8;
- unsigned int cpu = cpumask_first(mask_val);
+ unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
u32 val, mask, bit;
- if (cpu >= 8)
+ if (cpu >= 8 || cpu >= nr_cpu_ids)
return -EINVAL;
mask = 0xff << shift;
@@ -193,7 +193,7 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
writel_relaxed(val | bit, reg);
spin_unlock(&irq_controller_lock);
- return 0;
+ return IRQ_SET_MASK_OK;
}
#endif