Commit e89eb438 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86: sparse_irq needs spin_lock in allocations 



Suresh Siddha noticed that we should have a spinlock around it.

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7ddfb650

arch/x86/kernel/io_apic.c

+12 −1
Original line number Diff line number Diff line
@@ -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

	{

kernel/irq/handle.c

+12 −1
Original line number Diff line number Diff line
@@ -107,6 +107,11 @@ static void init_kstat_irqs(struct irq_desc *desc, int nr_desc, int nr) 
	}

}



/*

 * Protect the sparse_irqs_free freelist:

 */

static DEFINE_SPINLOCK(sparse_irq_lock);



#ifdef CONFIG_HAVE_SPARSE_IRQ

static struct irq_desc *sparse_irqs_free;

struct irq_desc *sparse_irqs;
@@ -166,11 +171,13 @@ struct irq_desc *irq_to_desc(unsigned int irq) 
	}

	return NULL;

}



struct irq_desc *irq_to_desc_alloc(unsigned int irq)

{

	struct irq_desc *desc, *desc_pri;

	int i;

	unsigned long flags;

	int count = 0;

	int i;



	desc_pri = desc = sparse_irqs;

	while (desc) {
@@ -182,6 +189,7 @@ struct irq_desc *irq_to_desc_alloc(unsigned int irq) 
		count++;

	}



	spin_lock_irqsave(&sparse_irq_lock, flags);

	/*

	 *  we run out of pre-allocate ones, allocate more

	 */
@@ -223,6 +231,9 @@ struct irq_desc *irq_to_desc_alloc(unsigned int irq) 
	else

		sparse_irqs = desc;

	desc->irq = irq;



	spin_unlock_irqrestore(&sparse_irq_lock, flags);



	printk(KERN_DEBUG "found new irq_desc for irq %d\n", desc->irq);

#ifdef CONFIG_HAVE_SPARSE_IRQ_DEBUG

	{

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