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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-21 14:00:57 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-21 14:04:17 (GMT) |
| commit | 5dfc54e087c15f823ee9b6541d2f0f314e69cbed (patch) | |
| tree | 845cabe598342a9dea2b77dafef629961ee0c89c /arch/arm/common | |
| parent | 2ef75701d1711a1feee2a82b42a2597ddc05f88b (diff) | |
| download | linux-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.c | 6 |
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 |