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irqdesc: Add a resource managed version of irq_alloc_descs()

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Add a devres flavor of __devm_irq_alloc_descs() and corresponding
helper macros.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Link: http://lkml.kernel.org/r/1486729403-21132-1-git-send-email-bgolaszewski@baylibre.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Bartosz Golaszewski
2017-02-10 13:23:23 +01:00
committed by Thomas Gleixner
parent b4f2d7c342
commit 2b5e77308f
3 changed files with 79 additions and 0 deletions
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55
kernel/irq/devres.c
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@@ -2,6 +2,7 @@
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/gfp.h>
#include <linux/irq.h>
/*
* Device resource management aware IRQ request/free implementation.
@@ -137,3 +138,57 @@ void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
free_irq(irq, dev_id);
}
EXPORT_SYMBOL(devm_free_irq);
struct irq_desc_devres {
unsigned int from;
unsigned int cnt;
};
static void devm_irq_desc_release(struct device *dev, void *res)
{
struct irq_desc_devres *this = res;
irq_free_descs(this->from, this->cnt);
}
/**
* __devm_irq_alloc_descs - Allocate and initialize a range of irq descriptors
* for a managed device
* @dev: Device to allocate the descriptors for
* @irq: Allocate for specific irq number if irq >= 0
* @from: Start the search from this irq number
* @cnt: Number of consecutive irqs to allocate
* @node: Preferred node on which the irq descriptor should be allocated
* @owner: Owning module (can be NULL)
* @affinity: Optional pointer to an affinity mask array of size @cnt
* which hints where the irq descriptors should be allocated
* and which default affinities to use
*
* Returns the first irq number or error code.
*
* Note: Use the provided wrappers (devm_irq_alloc_desc*) for simplicity.
*/
int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
unsigned int cnt, int node, struct module *owner,
const struct cpumask *affinity)
{
struct irq_desc_devres *dr;
int base;
dr = devres_alloc(devm_irq_desc_release, sizeof(*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
base = __irq_alloc_descs(irq, from, cnt, node, owner, affinity);
if (base < 0) {
devres_free(dr);
return base;
}
dr->from = base;
dr->cnt = cnt;
devres_add(dev, dr);
return base;
}
EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);