Replace open code with coresight_path_first_node() and coresight_path_last_node() for fetching the nodes.
Check that the node is not NULL before accessing csdev field.
Tested-by: Jie Gan jie.gan@oss.qualcomm.com Reviewed-by: Yeoreum Yun yeoreum.yun@arm.com Reviewed-by: James Clark james.clark@linaro.org Tested-by: James Clark james.clark@linaro.org Signed-off-by: Leo Yan leo.yan@arm.com --- drivers/hwtracing/coresight/coresight-core.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 0c82869b21cb734ab3ae96123c53c78071281cd6..2effbde0133b79c81ba72dd9b1ed6510523370d1 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -174,11 +174,16 @@ void coresight_put_percpu_source_ref(struct coresight_device *csdev) struct coresight_device *coresight_get_source(struct coresight_path *path) { struct coresight_device *csdev; + struct coresight_node *nd;
if (!path) return NULL;
- csdev = list_first_entry(&path->path_list, struct coresight_node, link)->csdev; + nd = coresight_path_first_node(path); + if (!nd) + return NULL; + + csdev = nd->csdev; if (!coresight_is_device_source(csdev)) return NULL;
@@ -711,11 +716,16 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode) struct coresight_device *coresight_get_sink(struct coresight_path *path) { struct coresight_device *csdev; + struct coresight_node *nd;
if (!path) return NULL;
- csdev = list_last_entry(&path->path_list, struct coresight_node, link)->csdev; + nd = coresight_path_last_node(path); + if (!nd) + return NULL; + + csdev = nd->csdev; if (csdev->type != CORESIGHT_DEV_TYPE_SINK && csdev->type != CORESIGHT_DEV_TYPE_LINKSINK) return NULL;