diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/devres.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c index 74d90a754268..18babef39361 100644 --- a/kernel/irq/devres.c +++ b/kernel/irq/devres.c @@ -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); |