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[IA64] Cleanup lock order in iosapic_register_intr 

Cleanup order of irq_desc.lock and iosapic_lock in
iosapic_register_intr() and iosapic_unregister_intr().

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Yasuaki Ishimatsu 2007-07-17 21:20:54 +09:00 committed by Tony Luck
parent c5e3f9e5a2
commit 40598cbe9c
1 changed files with 20 additions and 30 deletions
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50
arch/ia64/kernel/iosapic.c
View File

@ -505,7 +505,7 @@ iosapic_version (char __iomem *addr)
static int iosapic_find_sharable_vector (unsigned long trigger,
unsigned long pol)
{
int i, vector = -1, min_count = -1;
int i, vector = -ENOSPC, min_count = -1;
struct iosapic_intr_info *info;
/*
@ -513,7 +513,7 @@ static int iosapic_find_sharable_vector (unsigned long trigger,
* supported yet
*/
if (trigger == IOSAPIC_EDGE)
return -1;
return -EINVAL;
for (i = IA64_FIRST_DEVICE_VECTOR; i <= IA64_LAST_DEVICE_VECTOR; i++) {
info = &iosapic_intr_info[i];
@ -762,7 +762,7 @@ iosapic_register_intr (unsigned int gsi,
unsigned long flags;
struct iosapic_rte_info *rte;
u32 low32;
again:
/*
* If this GSI has already been registered (i.e., it's a
* shared interrupt, or we lost a race to register it),
@ -773,36 +773,24 @@ iosapic_register_intr (unsigned int gsi,
if (vector > 0) {
rte = gsi_vector_to_rte(gsi, vector);
rte->refcnt++;
spin_unlock_irqrestore(&iosapic_lock, flags);
return vector;
goto unlock_iosapic_lock;
}
spin_unlock_irqrestore(&iosapic_lock, flags);
/* If vector is running out, we try to find a sharable vector */
vector = assign_irq_vector(AUTO_ASSIGN);
if (vector < 0) {
vector = iosapic_find_sharable_vector(trigger, polarity);
if (vector < 0)
return -ENOSPC;
}
spin_lock_irqsave(&irq_desc[vector].lock, flags);
spin_lock(&iosapic_lock);
if (gsi_to_vector(gsi) > 0) {
if (list_empty(&iosapic_intr_info[vector].rtes))
free_irq_vector(vector);
spin_unlock(&iosapic_lock);
spin_unlock_irqrestore(&irq_desc[vector].lock, flags);
goto again;
goto unlock_iosapic_lock;
}
spin_lock(&irq_desc[vector].lock);
dest = get_target_cpu(gsi, vector);
err = register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY,
polarity, trigger);
if (err < 0) {
spin_unlock(&iosapic_lock);
spin_unlock_irqrestore(&irq_desc[vector].lock, flags);
return err;
vector = err;
goto unlock_all;
}
/*
@ -813,14 +801,15 @@ iosapic_register_intr (unsigned int gsi,
if (vector_is_shared(vector) && !(low32 & IOSAPIC_MASK))
mask = 0;
set_rte(gsi, vector, dest, mask);
spin_unlock(&iosapic_lock);
spin_unlock_irqrestore(&irq_desc[vector].lock, flags);
printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
(polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
cpu_logical_id(dest), dest, vector);
unlock_all:
spin_unlock(&irq_desc[vector].lock);
unlock_iosapic_lock:
spin_unlock_irqrestore(&iosapic_lock, flags);
return vector;
}
@ -849,9 +838,7 @@ iosapic_unregister_intr (unsigned int gsi)
}
vector = irq_to_vector(irq);
idesc = irq_desc + irq;
spin_lock_irqsave(&idesc->lock, flags);
spin_lock(&iosapic_lock);
spin_lock_irqsave(&iosapic_lock, flags);
if ((rte = gsi_vector_to_rte(gsi, vector)) == NULL) {
printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n",
gsi);
@ -862,13 +849,17 @@ iosapic_unregister_intr (unsigned int gsi)
if (--rte->refcnt > 0)
goto out;
/* Remove the rte entry from the list */
idesc = irq_desc + irq;
spin_lock(&idesc->lock);
list_del(&rte->rte_list);
spin_unlock(&idesc->lock);
/* Mask the interrupt */
low32 = iosapic_intr_info[vector].low32 | IOSAPIC_MASK;
iosapic_write(rte->iosapic->addr,
IOSAPIC_RTE_LOW(rte->rte_index), low32);
/* Remove the rte entry from the list */
list_del(&rte->rte_list);
iosapic_intr_info[vector].count--;
iosapic_free_rte(rte);
index = find_iosapic(gsi);
@ -913,8 +904,7 @@ iosapic_unregister_intr (unsigned int gsi)
free_irq_vector(vector);
}
out:
spin_unlock(&iosapic_lock);
spin_unlock_irqrestore(&idesc->lock, flags);
spin_unlock_irqrestore(&iosapic_lock, flags);
}
/*