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[PATCH 2/3] devres: Add devres_release()

 

 

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broonie at opensource

May 3, 2012, 10:15 AM

Post #1 of 1 (58 views)
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[PATCH 2/3] devres: Add devres_release()

APIs using devres frequently want to implement a "remove and free the
resource" operation so it seems sensible that they should be able to
just have devres do the freeing for them since that's a big part of what
devres is all about.

Signed-off-by: Mark Brown <broonie [at] opensource>
---
drivers/base/devres.c | 31 +++++++++++++++++++++++++++++++
include/linux/device.h | 2 ++
2 files changed, 33 insertions(+)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 1741a60..2360adb 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -330,6 +330,37 @@ int devres_destroy(struct device *dev, dr_release_t release,
}
EXPORT_SYMBOL_GPL(devres_destroy);

+
+/**
+ * devres_release - Find a device resource and destroy it, calling release
+ * @dev: Device to find resource from
+ * @release: Look for resources associated with this release function
+ * @match: Match function (optional)
+ * @match_data: Data for the match function
+ *
+ * Find the latest devres of @dev associated with @release and for
+ * which @match returns 1. If @match is NULL, it's considered to
+ * match all. If found, the resource is removed atomically, the
+ * release function called and the resource freed.
+ *
+ * RETURNS:
+ * 0 if devres is found and freed, -ENOENT if not found.
+ */
+int devres_release(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data)
+{
+ void *res;
+
+ res = devres_remove(dev, release, match, match_data);
+ if (unlikely(!res))
+ return -ENOENT;
+
+ (*release)(dev, res);
+ devres_free(res);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devres_release);
+
static int remove_nodes(struct device *dev,
struct list_head *first, struct list_head *end,
struct list_head *todo)
diff --git a/include/linux/device.h b/include/linux/device.h
index e3399290..5c7fdbd 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -541,6 +541,8 @@ extern void *devres_remove(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data);
extern int devres_destroy(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data);
+extern int devres_release(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data);

/* devres group */
extern void * __must_check devres_open_group(struct device *dev, void *id,
--
1.7.10

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