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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2017-02-10 13:23:23 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-02-10 14:39:20 +0100
commit2b5e77308f3356faad640b24af6dc5aa7233eb2d (patch)
tree9be3459eddd83c7c2ee84dd8ce2624f90b06a1e8 /kernel/irq/devres.c
parentb4f2d7c3424c00de162c042a5a3a5ed19974677c (diff)
downloadlinux-stericsson-2b5e77308f3356faad640b24af6dc5aa7233eb2d.tar.gz
irqdesc: Add a resource managed version of irq_alloc_descs()
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>
Diffstat (limited to 'kernel/irq/devres.c')
-rw-r--r--kernel/irq/devres.c55
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);