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irqbypass: Disallow NULL token

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A NULL token is meaningless and can only lead to unintended problems.
Error on registration with a NULL token, ignore de-registrations with
a NULL token.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alex Williamson 2016-05-05 11:58:29 -06:00 committed by Paolo Bonzini
parent 0b1b1dfd52
commit b52f3ed022
2 changed files with 13 additions and 3 deletions
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4
include/linux/irqbypass.h
View file

@ -34,7 +34,7 @@ struct irq_bypass_consumer;
/**
* struct irq_bypass_producer - IRQ bypass producer definition
* @node: IRQ bypass manager private list management
* @token: opaque token to match between producer and consumer
* @token: opaque token to match between producer and consumer (non-NULL)
* @irq: Linux IRQ number for the producer device
* @add_consumer: Connect the IRQ producer to an IRQ consumer (optional)
* @del_consumer: Disconnect the IRQ producer from an IRQ consumer (optional)
@ -60,7 +60,7 @@ struct irq_bypass_producer {
/**
* struct irq_bypass_consumer - IRQ bypass consumer definition
* @node: IRQ bypass manager private list management
* @token: opaque token to match between producer and consumer
* @token: opaque token to match between producer and consumer (non-NULL)
* @add_producer: Connect the IRQ consumer to an IRQ producer
* @del_producer: Disconnect the IRQ consumer from an IRQ producer
* @stop: Perform any quiesce operations necessary prior to add/del (optional)

12
virt/lib/irqbypass.c
View file

@ -89,6 +89,9 @@ int irq_bypass_register_producer(struct irq_bypass_producer *producer)
struct irq_bypass_producer *tmp;
struct irq_bypass_consumer *consumer;
if (!producer->token)
return -EINVAL;
might_sleep();
if (!try_module_get(THIS_MODULE))
@ -136,6 +139,9 @@ void irq_bypass_unregister_producer(struct irq_bypass_producer *producer)
struct irq_bypass_producer *tmp;
struct irq_bypass_consumer *consumer;
if (!producer->token)
return;
might_sleep();
if (!try_module_get(THIS_MODULE))
@ -177,7 +183,8 @@ int irq_bypass_register_consumer(struct irq_bypass_consumer *consumer)
struct irq_bypass_consumer *tmp;
struct irq_bypass_producer *producer;
if (!consumer->add_producer || !consumer->del_producer)
if (!consumer->token ||
!consumer->add_producer || !consumer->del_producer)
return -EINVAL;
might_sleep();
@ -227,6 +234,9 @@ void irq_bypass_unregister_consumer(struct irq_bypass_consumer *consumer)
struct irq_bypass_consumer *tmp;
struct irq_bypass_producer *producer;
if (!consumer->token)
return;
might_sleep();
if (!try_module_get(THIS_MODULE))