diff options
| author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-02-18 01:51:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-20 23:11:01 +0100 |
| commit | b6404e21f023e4aa208a0ba03d55a9c8a57cb940 (patch) | |
| tree | 6a752cea9d6393139da93e8b20b87a2e7d0e433f /drivers/hwtracing | |
| parent | coresight: associating path with session rather than tracer (diff) | |
| download | linux-b6404e21f023e4aa208a0ba03d55a9c8a57cb940.tar.xz linux-b6404e21f023e4aa208a0ba03d55a9c8a57cb940.zip | |
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: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-priv.h | 1 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight.c | 15 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 7b193a34d709..14f245a2018d 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -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); diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index f26589effb70..2ed48545df26 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -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. |