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authorJan Beulich <jbeulich@novell.com>2006-06-26 13:56:43 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 10:48:15 -0700
commit0a1ad60d7a7eb433095bc1b2c8b475f3f278f61d (patch)
treeb7f0efd5d2afb879b8ff9bfbc44c6ea94b3e7a89 /arch/i386/kernel
parenta32073bffc656ca4bde6002b6cf7c1a8e0e22712 (diff)
[PATCH] x86_64: serialize assign_irq_vector() use of static variables
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>
Diffstat (limited to 'arch/i386/kernel')
-rw-r--r--arch/i386/kernel/io_apic.c24
1 files changed, 18 insertions, 6 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index a62df3e764c..43ffdd012d2 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -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 != AUTO_ASSIGN && (unsigned)irq >= NR_IRQ_VECTORS);
+
+ spin_lock(&vector_lock);
- BUG_ON(irq >= NR_IRQ_VECTORS);
- if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0)
+ 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;
+
+ spin_unlock(&vector_lock);
- return current_vector;
+ return vector;
}
static struct hw_interrupt_type ioapic_level_type;