From cde59bef2f155fc38413e470ff0e4672623cdbec Mon Sep 17 00:00:00 2001 From: Tony Wu Date: Fri, 21 Jun 2013 10:13:08 +0000 Subject: [PATCH 201/215] MIPS: GIC: Fix gic_set_affinity infinite loop There is an infinite loop in gic_set_affinity. When irq_set_affinity gets called on gic controller, it blocks forever. Signed-off-by: Tony Wu Cc: Steven J. Hill Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5537/ Signed-off-by: Ralf Baechle (cherry picked from commit c214c03512b67e56dea3f4471705f8caae49553a) --- arch/mips/kernel/irq-gic.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) --- a/arch/mips/kernel/irq-gic.c +++ b/arch/mips/kernel/irq-gic.c @@ -219,16 +219,15 @@ static int gic_set_affinity(struct irq_d /* Assumption : cpumask refers to a single CPU */ spin_lock_irqsave(&gic_lock, flags); - for (;;) { - /* Re-route this IRQ */ - GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp)); - /* Update the pcpu_masks */ - for (i = 0; i < NR_CPUS; i++) - clear_bit(irq, pcpu_masks[i].pcpu_mask); - set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask); + /* Re-route this IRQ */ + GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp)); + + /* Update the pcpu_masks */ + for (i = 0; i < NR_CPUS; i++) + clear_bit(irq, pcpu_masks[i].pcpu_mask); + set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask); - } cpumask_copy(d->affinity, cpumask); spin_unlock_irqrestore(&gic_lock, flags);