Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2d441681 authored by Milton Miller's avatar Milton Miller Committed by Benjamin Herrenschmidt
Browse files

powerpc: Return early if irq_host lookup type is wrong 



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: default avatarMilton Miller <miltonm@bga.com>
Reviewed-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 3af259d1

arch/powerpc/kernel/irq.c

+7 −5
Original line number Diff line number Diff line
@@ -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))