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authorJiang Liu <jiang.liu@linux.intel.com>2014-10-27 16:11:58 +0800
committerThomas Gleixner <tglx@linutronix.de>2014-12-16 14:08:16 +0100
commitb794ef26f1b08f712f970fe07290b96f9e070746 (patch)
treee66a23783670bbf57f14bb6257bbfb8373fbecdb /arch/x86
parentcb39288cd6c6dfd0e87c6e161d9da1ec6974f4b8 (diff)
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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 <jiang.liu@linux.intel.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Grant Likely <grant.likely@linaro.org> Cc: Prarit Bhargava <prarit@redhat.com> Link: http://lkml.kernel.org/r/1414397531-28254-8-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/apic/io_apic.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4d871339ba4f..ab8ca9327c06 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);
}