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genirq: Return the IRQ name from free_irq()

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This allows callers to get back at them instead of having to store it in
another variable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Christoph Hellwig 2017-04-13 09:06:41 +02:00 committed by Bjorn Helgaas
parent a7e60e55d7
commit 25ce4be724
2 changed files with 11 additions and 4 deletions
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2
include/linux/interrupt.h
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@ -155,7 +155,7 @@ extern int __must_check
request_percpu_irq(unsigned int irq, irq_handler_t handler,
const char *devname, void __percpu *percpu_dev_id);
extern void free_irq(unsigned int, void *);
extern const void *free_irq(unsigned int, void *);
extern void free_percpu_irq(unsigned int, void __percpu *);
struct device;

13
kernel/irq/manage.c
View File

@ -1574,20 +1574,27 @@ EXPORT_SYMBOL_GPL(remove_irq);
* have completed.
*
* This function must not be called from interrupt context.
*
* Returns the devname argument passed to request_irq.
*/
void free_irq(unsigned int irq, void *dev_id)
const void *free_irq(unsigned int irq, void *dev_id)
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
const char *devname;
if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
return;
return NULL;
#ifdef CONFIG_SMP
if (WARN_ON(desc->affinity_notify))
desc->affinity_notify = NULL;
#endif
kfree(__free_irq(irq, dev_id));
action = __free_irq(irq, dev_id);
devname = action->name;
kfree(action);
return devname;
}
EXPORT_SYMBOL(free_irq);