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powerpc: Return early if irq_host lookup type is wrong

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If for some reason the code incrorectly calls the wrong function to
manage the revmap, not only should we warn, we should take action.
However, in the paths we expect to be taken every delivered interrupt
change to WARN_ON_ONCE.  Use the if (WARN_ON(x)) format to get the
unlikely for free.

Signed-off-by: Milton Miller <miltonm@bga.com>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Milton Miller 2011-05-10 19:29:57 +00:00 committed by Benjamin Herrenschmidt
parent 3af259d155
commit 2d441681a4
1 changed files with 7 additions and 5 deletions
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12
arch/powerpc/kernel/irq.c
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@ -814,8 +814,7 @@ void irq_dispose_mapping(unsigned int virq)
return;
host = irq_map[virq].host;
WARN_ON (host == NULL);
if (host == NULL)
if (WARN_ON(host == NULL))
return;
/* Never unmap legacy interrupts */
@ -898,7 +897,8 @@ unsigned int irq_radix_revmap_lookup(struct irq_host *host,
struct irq_map_entry *ptr;
unsigned int virq;
WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
return irq_find_mapping(host, hwirq);
/*
* No rcu_read_lock(ing) needed, the ptr returned can't go under us
@ -922,7 +922,8 @@ unsigned int irq_radix_revmap_lookup(struct irq_host *host,
void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
irq_hw_number_t hwirq)
{
WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
return;
if (virq != NO_IRQ) {
mutex_lock(&revmap_trees_mutex);
@ -937,7 +938,8 @@ unsigned int irq_linear_revmap(struct irq_host *host,
{
unsigned int *revmap;
WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
return irq_find_mapping(host, hwirq);
/* Check revmap bounds */
if (unlikely(hwirq >= host->revmap_data.linear.size))