From b794ef26f1b08f712f970fe07290b96f9e070746 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 27 Oct 2014 16:11:58 +0800 Subject: x86, irq: Protect __clear_irq_vector() with vector_lock Function __clear_irq_vector() accesses vector related data structure, so protect it with vector_lock. Also rename it as clear_irq_vector(). Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Joerg Roedel Cc: Greg Kroah-Hartman Cc: Benjamin Herrenschmidt Cc: Rafael J. Wysocki Cc: Bjorn Helgaas Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Grant Likely Cc: Prarit Bhargava Link: http://lkml.kernel.org/r/1414397531-28254-8-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- arch/x86/kernel/apic/io_apic.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) (limited to 'arch/x86') diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 4d87133..ab8ca9327 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -1349,10 +1349,12 @@ int assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask) return err; } -static void __clear_irq_vector(int irq, struct irq_cfg *cfg) +static void clear_irq_vector(int irq, struct irq_cfg *cfg) { int cpu, vector; + unsigned long flags; + raw_spin_lock_irqsave(&vector_lock, flags); BUG_ON(!cfg->vector); vector = cfg->vector; @@ -1362,8 +1364,11 @@ static void __clear_irq_vector(int irq, struct irq_cfg *cfg) cfg->vector = 0; cpumask_clear(cfg->domain); - if (likely(!cfg->move_in_progress)) + if (likely(!cfg->move_in_progress)) { + raw_spin_unlock_irqrestore(&vector_lock, flags); return; + } + for_each_cpu_and(cpu, cfg->old_domain, cpu_online_mask) { for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) { if (per_cpu(vector_irq, cpu)[vector] != irq) @@ -1373,6 +1378,7 @@ static void __clear_irq_vector(int irq, struct irq_cfg *cfg) } } cfg->move_in_progress = 0; + raw_spin_unlock_irqrestore(&vector_lock, flags); } void __setup_vector_irq(int cpu) @@ -1499,7 +1505,7 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg, &dest)) { pr_warn("Failed to obtain apicid for ioapic %d, pin %d\n", mpc_ioapic_id(attr->ioapic), attr->ioapic_pin); - __clear_irq_vector(irq, cfg); + clear_irq_vector(irq, cfg); return; } @@ -1513,7 +1519,7 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg, if (x86_io_apic_ops.setup_entry(irq, &entry, dest, cfg->vector, attr)) { pr_warn("Failed to setup ioapic entry for ioapic %d, pin %d\n", mpc_ioapic_id(attr->ioapic), attr->ioapic_pin); - __clear_irq_vector(irq, cfg); + clear_irq_vector(irq, cfg); return; } @@ -3083,12 +3089,9 @@ int arch_setup_hwirq(unsigned int irq, int node) void arch_teardown_hwirq(unsigned int irq) { struct irq_cfg *cfg = irq_cfg(irq); - unsigned long flags; free_remapped_irq(irq); - raw_spin_lock_irqsave(&vector_lock, flags); - __clear_irq_vector(irq, cfg); - raw_spin_unlock_irqrestore(&vector_lock, flags); + clear_irq_vector(irq, cfg); free_irq_cfg(irq, cfg); } -- cgit v1.1