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Date: Thu, 18 Jul 2013 13:19:24 +0300
From: Oleksandr Kravchenko <x0199363@...com>
To: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-doc@...r.kernel.org>
CC: <grant.likely@...aro.org>, <rob.herring@...xeda.com>,
<rob@...dley.net>, <jic23@....ac.uk>, <pmeerw@...erw.net>,
<holler@...oftware.de>, <srinivas.pandruvada@...el.com>,
<devicetree-discuss@...ts.ozlabs.org>, <grygorii.strashko@...com>,
Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
Subject: [PATCH 1/3] iio: core: implement devm_iio_device_alloc/devm_iio_device_free
From: Grygorii Strashko <grygorii.strashko@...com>
Add a resource managed devm_iio_device_alloc()/devm_iio_device_free()
to automatically clean up any allocations made by IIO drivers,
thus leading to simplified IIO drivers code.
In addition, this will allow IIO drivers to use other devm_*() API
(like devm_request_irq) and don't care about the race between
iio_device_free() and the release of resources by Device core
during driver removing.
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
[o.v.kravchenko@...ballogic.com: fix return value ib devm_iio_device_alloc
in case if devres_alloc failed, remove unused variable "rc"]
Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
Tested-by: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
---
drivers/iio/industrialio-core.c | 47 +++++++++++++++++++++++++++++++++++++++
include/linux/iio/iio.h | 25 +++++++++++++++++++++
2 files changed, 72 insertions(+)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index e145931..d56d122 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -912,6 +912,53 @@ void iio_device_free(struct iio_dev *dev)
}
EXPORT_SYMBOL(iio_device_free);
+static void devm_iio_device_release(struct device *dev, void *res)
+{
+ iio_device_free(*(struct iio_dev **)res);
+}
+
+static int devm_iio_device_match(struct device *dev, void *res, void *data)
+{
+ struct iio_dev **r = res;
+ if (!r || !*r) {
+ WARN_ON(!r || !*r);
+ return 0;
+ }
+ return *r == data;
+}
+
+struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
+{
+ struct iio_dev **ptr, *iio_dev;
+
+ ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return NULL;
+
+ /* use raw alloc_dr for kmalloc caller tracing */
+ iio_dev = iio_device_alloc(sizeof_priv);
+ if (iio_dev) {
+ *ptr = iio_dev;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return iio_dev;
+}
+EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
+
+void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
+{
+ int rc;
+
+ rc = devres_release(dev, devm_iio_device_release,
+ devm_iio_device_match, iio_dev);
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_iio_device_free);
+
/**
* iio_chrdev_open() - chrdev file open for buffer access and ioctls
**/
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 8d171f4..f1d99f6 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -532,6 +532,31 @@ static inline struct iio_dev *iio_priv_to_dev(void *priv)
void iio_device_free(struct iio_dev *indio_dev);
/**
+ * devm_iio_device_alloc - Resource-managed iio_device_alloc()
+ * @dev: Device to allocate iio_dev for
+ * @sizeof_priv: Space to allocate for private structure.
+ *
+ * Managed iio_device_alloc. iio_dev allocated with this function is
+ * automatically freed on driver detach.
+ *
+ * If an iio_dev allocated with this function needs to be freed separately,
+ * devm_iio_device_free() must be used.
+ *
+ * RETURNS:
+ * Pointer to allocated iio_dev on success, NULL on failure.
+ */
+struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv);
+
+/**
+ * devm_iio_device_free - Resource-managed iio_device_free()
+ * @dev: Device this iio_dev belongs to
+ * @indio_dev: the iio_dev associated with the device
+ *
+ * Free indio_dev allocated with devm_iio_device_alloc().
+ */
+void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev);
+
+/**
* iio_buffer_enabled() - helper function to test if the buffer is enabled
* @indio_dev: IIO device structure for device
**/
--
1.7.9.5
--
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