Commit b6404e21 authored by Mathieu Poirier's avatar Mathieu Poirier Committed by Greg Kroah-Hartman
Browse files

coresight: add API to get sink from path 



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: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b3e94405

drivers/hwtracing/coresight/coresight-priv.h

+1 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ static inline void CS_UNLOCK(void __iomem *addr) 


void coresight_disable_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);

void coresight_release_path(struct list_head *path);

drivers/hwtracing/coresight/coresight.c

+15 −0
Original line number Diff line number Diff line
@@ -321,6 +321,21 @@ err: 
	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.

 * @csdev:	The device to start from.

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