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| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-08-20 20:46:25 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-16 16:52:59 +0200 |
| commit | e89eb43863c2d9f11a3bbe766766fe646e6c50d9 (patch) | |
| tree | 3d45bdf7efb5a37edb99f62cbea1d500b3003468 /arch/x86/kernel/io_apic.c | |
| parent | 7ddfb650c7ef7a33a5ef11c0fdf5b3d837a47dba (diff) | |
| download | linux-next-e89eb43863c2d9f11a3bbe766766fe646e6c50d9.tar.gz | |
x86: sparse_irq needs spin_lock in allocations
Suresh Siddha noticed that we should have a spinlock around it.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/io_apic.c')
| -rw-r--r-- | arch/x86/kernel/io_apic.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c index 34c74cf5c244..7ca556690474 100644 --- a/arch/x86/kernel/io_apic.c +++ b/arch/x86/kernel/io_apic.c @@ -146,6 +146,12 @@ static void init_one_irq_cfg(struct irq_cfg *cfg) } static struct irq_cfg *irq_cfgx; + +/* + * Protect the irq_cfgx_free freelist: + */ +static DEFINE_SPINLOCK(irq_cfg_lock); + #ifdef CONFIG_HAVE_SPARSE_IRQ static struct irq_cfg *irq_cfgx_free; #endif @@ -213,8 +219,9 @@ static struct irq_cfg *irq_cfg(unsigned int irq) static struct irq_cfg *irq_cfg_alloc(unsigned int irq) { struct irq_cfg *cfg, *cfg_pri; - int i; + unsigned long flags; int count = 0; + int i; cfg_pri = cfg = irq_cfgx; while (cfg) { @@ -226,6 +233,7 @@ static struct irq_cfg *irq_cfg_alloc(unsigned int irq) count++; } + spin_lock_irqsave(&irq_cfg_lock, flags); if (!irq_cfgx_free) { unsigned long phys; unsigned long total_bytes; @@ -263,6 +271,9 @@ static struct irq_cfg *irq_cfg_alloc(unsigned int irq) else irq_cfgx = cfg; cfg->irq = irq; + + spin_unlock_irqrestore(&irq_cfg_lock, flags); + printk(KERN_DEBUG "found new irq_cfg for irq %d\n", cfg->irq); #ifdef CONFIG_HAVE_SPARSE_IRQ_DEBUG { |