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Date: Fri, 13 Nov 2015 11:45:00 -0700 From: Mathieu Poirier <mathieu.poirier@...aro.org> To: gregkh@...uxfoundation.org, a.p.zijlstra@...llo.nl, alexander.shishkin@...ux.intel.com, acme@...nel.org, mingo@...hat.com, corbet@....net, nicolas.pitre@...aro.org Cc: adrian.hunter@...el.com, zhang.chunyan@...aro.org, mike.leach@....com, tor@...com, al.grant@....com, pawel.moll@....com, fainelli@...adcom.com, linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org Subject: [PATCH V4 09/26] 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@...aro.org> --- drivers/hwtracing/coresight/coresight-priv.h | 1 + drivers/hwtracing/coresight/coresight.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 2dc59a5c5b1e..ed116b303e87 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -60,6 +60,7 @@ 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 7e4064b31c99..47a4e109f700 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -322,6 +322,21 @@ 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. -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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