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coresight: add API to get sink from path

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Add an API allowing external code to quickly get a handle on the
sink within a path.  The sink is always last, but adding an API allows
to keep the path's node structure private and remove redundant checks.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b6404e21f023e4aa208a0ba03d55a9c8a57cb940)
This commit is contained in:
Mathieu Poirier 2016-02-17 17:51:46 -07:00
parent fde79d4de7
commit f72b3bc46d
2 changed files with 16 additions and 0 deletions
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1
drivers/hwtracing/coresight/coresight-priv.h
View file

@ -54,6 +54,7 @@ static inline void CS_UNLOCK(void __iomem *addr)
void coresight_disable_path(struct list_head *path); void coresight_disable_path(struct list_head *path);
int coresight_enable_path(struct list_head *path); int coresight_enable_path(struct list_head *path);
struct coresight_device *coresight_get_sink(struct list_head *path);
struct list_head *coresight_build_path(struct coresight_device *csdev); struct list_head *coresight_build_path(struct coresight_device *csdev);
void coresight_release_path(struct list_head *path); void coresight_release_path(struct list_head *path);

15
drivers/hwtracing/coresight/coresight.c
View file

@ -321,6 +321,21 @@ err:
goto out; goto out;
} }
struct coresight_device *coresight_get_sink(struct list_head *path)
{
struct coresight_device *csdev;
if (!path)
return NULL;
csdev = list_last_entry(path, struct coresight_node, link)->csdev;
if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
return NULL;
return csdev;
}
/** /**
* _coresight_build_path - recursively build a path from a @csdev to a sink. * _coresight_build_path - recursively build a path from a @csdev to a sink.
* @csdev: The device to start from. * @csdev: The device to start from.