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[PATCH] x86_64: serialize assign_irq_vector() use of static variables

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Since assign_irq_vector() can be called at runtime, its access of static
variables should be protected by a lock.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-06-26 13:56:43 +02:00 committed by Linus Torvalds
parent a32073bffc
commit 0a1ad60d7a
2 changed files with 32 additions and 10 deletions
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24
arch/i386/kernel/io_apic.c
View file

@ -50,6 +50,7 @@ atomic_t irq_mis_count;
static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
static DEFINE_SPINLOCK(ioapic_lock);
static DEFINE_SPINLOCK(vector_lock);
int timer_over_8254 __initdata = 1;
@ -1161,10 +1162,16 @@ u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
int assign_irq_vector(int irq)
{
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
int vector;
BUG_ON(irq >= NR_IRQ_VECTORS);
if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0)
BUG_ON(irq != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS);
spin_lock(&vector_lock);
if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0) {
spin_unlock(&vector_lock);
return IO_APIC_VECTOR(irq);
}
next:
current_vector += 8;
if (current_vector == SYSCALL_VECTOR)
@ -1172,16 +1179,21 @@ next:
if (current_vector >= FIRST_SYSTEM_VECTOR) {
offset++;
if (!(offset%8))
if (!(offset%8)) {
spin_unlock(&vector_lock);
return -ENOSPC;
}
current_vector = FIRST_DEVICE_VECTOR + offset;
}
vector_irq[current_vector] = irq;
vector = current_vector;
vector_irq[vector] = irq;
if (irq != AUTO_ASSIGN)
IO_APIC_VECTOR(irq) = current_vector;
IO_APIC_VECTOR(irq) = vector;
return current_vector;
spin_unlock(&vector_lock);
return vector;
}
static struct hw_interrupt_type ioapic_level_type;

18
arch/x86_64/kernel/io_apic.c
View file

@ -56,6 +56,7 @@ int timer_over_8254 __initdata = 0;
static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
static DEFINE_SPINLOCK(ioapic_lock);
static DEFINE_SPINLOCK(vector_lock);
/*
* # of IRQ routing registers
@ -834,10 +835,16 @@ u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
int assign_irq_vector(int irq)
{
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
int vector;
BUG_ON(irq != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS);
if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0)
spin_lock(&vector_lock);
if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0) {
spin_unlock(&vector_lock);
return IO_APIC_VECTOR(irq);
}
next:
current_vector += 8;
if (current_vector == IA32_SYSCALL_VECTOR)
@ -849,11 +856,14 @@ next:
current_vector = FIRST_DEVICE_VECTOR + offset;
}
vector_irq[current_vector] = irq;
vector = current_vector;
vector_irq[vector] = irq;
if (irq != AUTO_ASSIGN)
IO_APIC_VECTOR(irq) = current_vector;
IO_APIC_VECTOR(irq) = vector;
return current_vector;
spin_unlock(&vector_lock);
return vector;
}
extern void (*interrupt[NR_IRQS])(void);